Examples with solutions for Subtraction of Fractions: The common denominator is smaller than the product of the denominators

Exercise #1

Solve the following equation:

3416= ? \frac{3}{4}-\frac{1}{6}=\text{ ?}

Video Solution

Step-by-Step Solution

In this question, we need to find a common denominator.

However, we don't have to multiply the denominators by each other as there is a lowest common denominator: 12.

3×33×4 \frac{3\times3}{3\times4}

1×26×2 \frac{1\times2}{6\times2}

912212=9212=712 \frac{9}{12}-\frac{2}{12}=\frac{9-2}{12}=\frac{7}{12}

Answer

712 \frac{7}{12}

Exercise #2

Solve the following equation:

41014= \frac{4}{10}-\frac{1}{4}=

Video Solution

Step-by-Step Solution

We must first identify the lowest common denominator between 4 and 10.

In order to determine the lowest common denominator, we need to find a number that is divisible by both 4 and 10.

In this case, the common denominator is 20.

We will then proceed to multiply each fraction by the appropriate number to reach the denominator 20

We'll multiply the first fraction by 2

We'll multiply the second fraction by 5

4×210×21×54×5=820520 \frac{4\times2}{10\times2}-\frac{1\times5}{4\times5}=\frac{8}{20}-\frac{5}{20}

Finally we'll combine and obtain the following:

8520=320 \frac{8-5}{20}=\frac{3}{20}

Answer

320 \frac{3}{20}

Exercise #3

Solve the following equation:

71026= \frac{7}{10}-\frac{2}{6}=

Video Solution

Step-by-Step Solution

Let's first identify the lowest common denominator between 10 and 6.

In order to determine the lowest common denominator, we need to find a number that is divisible by both 10 and 6.

In this case, the common denominator is 30.

We will then proceed to multiply each fraction by the appropriate number to reach the denominator 30.

We'll multiply the first fraction by 3

We'll multiply the second fraction by 5

7×310×32×56×5=21301030 \frac{7\times3}{10\times3}-\frac{2\times5}{6\times5}=\frac{21}{30}-\frac{10}{30}

Now let's subtract:

211030=1130 \frac{21-10}{30}=\frac{11}{30}

Answer

1130 \frac{11}{30}

Exercise #4

Solve the following equation:

81026= \frac{8}{10}-\frac{2}{6}=

Video Solution

Step-by-Step Solution

Let's first identify the lowest common denominator between 6 and 10.

To determine the lowest common denominator, we need to find a number that is divisible by both 6 and 10.

In this case, the common denominator is 30.

Now we'll proceed to multiply each fraction by the appropriate number to reach the denominator 30.

We'll multiply the first fraction by 3

We'll multiply the second fraction by 5

8×310×32×56×5=24301030 \frac{8\times3}{10\times3}-\frac{2\times5}{6\times5}=\frac{24}{30}-\frac{10}{30}

Now let's subtract:

241030=1430 \frac{24-10}{30}=\frac{14}{30}

Answer

1430 \frac{14}{30}

Exercise #5

Solve the following equation:

1416= \frac{1}{4}-\frac{1}{6}=

Video Solution

Step-by-Step Solution

Let's first identify the lowest common denominator between 4 and 6.

In order to determine the lowest common denominator, we need to find a number that is divisible by both 4 and 6.

In this case, the common denominator is 12.

Let's proceed to multiply each fraction by the appropriate number to reach the denominator 12.

We'll multiply the first fraction by 3

We'll multiply the second fraction by 2

1×34×31×26×2=312212 \frac{1\times3}{4\times3}-\frac{1\times2}{6\times2}=\frac{3}{12}-\frac{2}{12}

Now let's subtract:

3212=112 \frac{3-2}{12}=\frac{1}{12}

Answer

112 \frac{1}{12}

Exercise #6

Solve the following equation:

5624= \frac{5}{6}-\frac{2}{4}=

Video Solution

Step-by-Step Solution

Let's first identify the lowest common denominator between 4 and 6

To determine the lowest common denominator, we need to find a number that is divisible by both 4 and 6.

In this case, the common denominator is 12.

Now we'll proceed to multiply each fraction by the appropriate number to reach the denominator 12.

We'll multiply the first fraction by 2

We'll multiply the second fraction by 3

5×26×22×34×3=1012612 \frac{5\times2}{6\times2}-\frac{2\times3}{4\times3}=\frac{10}{12}-\frac{6}{12}

Now let's subtract:

10612=412 \frac{10-6}{12}=\frac{4}{12}

Answer

412 \frac{4}{12}

Exercise #7

Solve the following exercise:

2349=? \frac{2}{3}-\frac{4}{9}=\text{?}

Video Solution

Step-by-Step Solution

To solve this problem, we'll perform the following steps:

  • Step 1: Find the Least Common Denominator (LCD) of 33 and 99.
  • Step 2: Convert each fraction to have the LCD as its denominator.
  • Step 3: Subtract the numerators of the converted fractions.
  • Step 4: Simplify the resulting fraction if needed.

Let's proceed with the steps:

Step 1: The denominators of the given fractions are 33 and 99. The LCD of 33 and 99 is 99 since 99 is the smallest multiple that both 33 and 99 divide into evenly.

Step 2: Convert each fraction to have a denominator of 99.

23 \frac{2}{3} can be converted to an equivalent fraction with the denominator 99 by multiplying the numerator and denominator by 3:

23×33=69 \frac{2}{3} \times \frac{3}{3} = \frac{6}{9}

The second fraction 49 \frac{4}{9} already has the denominator 99, so it remains unchanged.

Step 3: Subtract the fractions: 6949 \frac{6}{9} - \frac{4}{9} .

Since the denominators are now the same, subtract the numerators:

64=2 6 - 4 = 2

The resulting fraction is 29 \frac{2}{9} .

Step 4: Check if there is a need to simplify. The fraction 29 \frac{2}{9} is already in its simplest form.

Thus, the solution to the problem is 29 \frac{2}{9} .

Answer

29 \frac{2}{9}

Exercise #8

Solve the following exercise:

2416=? \frac{2}{4}-\frac{1}{6}=\text{?}

Video Solution

Step-by-Step Solution

To solve this problem, we will follow these steps:

  • Step 1: Simplify the initial fraction 24\frac{2}{4}.
  • Step 2: Find a common denominator for 12\frac{1}{2} and 16\frac{1}{6}.
  • Step 3: Convert the fractions to have the common denominator.
  • Step 4: Subtract the fractions.
  • Step 5: Simplify the resulting fraction.

Let's work through these steps:

Step 1: Simplify 24=12\frac{2}{4} = \frac{1}{2}.

Step 2: Identify the least common denominator (LCD) for 12\frac{1}{2} and 16\frac{1}{6}. The denominators are 2 and 6, and the LCM of 2 and 6 is 6.

Step 3: Convert both fractions to have this common denominator.
12=1×32×3=36\frac{1}{2} = \frac{1 \times 3}{2 \times 3} = \frac{3}{6}
16=16\frac{1}{6} = \frac{1}{6} (already with the correct denominator).

Step 4: Subtract the fractions:
3616=316=26\frac{3}{6} - \frac{1}{6} = \frac{3 - 1}{6} = \frac{2}{6}.

Step 5: Simplify the resulting fraction 26\frac{2}{6}. Find the greatest common divisor (GCD) of 2 and 6, which is 2, and divide both numerator and denominator by 2:
26=2÷26÷2=13\frac{2}{6} = \frac{2 \div 2}{6 \div 2} = \frac{1}{3}.

Therefore, the solution to the problem is 13\frac{1}{3}.

Answer

13 \frac{1}{3}

Exercise #9

Solve the following exercise:

2426=? \frac{2}{4}-\frac{2}{6}=\text{?}

Video Solution

Step-by-Step Solution

To solve this subtraction problem, let's follow these steps:

  • Step 1: Identify and find the least common denominator (LCD) of the denominators 4 and 6.
  • Step 2: Convert each fraction to have the common denominator.
  • Step 3: Subtract the numerators of the converted fractions.
  • Step 4: Simplify the result, if possible.

Now, let's work through each step:

Step 1: The denominators are 4 and 6. The LCD of 4 and 6 is 12, since 12 is the smallest number divisible by both 4 and 6.

Step 2: Convert each fraction to this common denominator.
- Convert 24 \frac{2}{4} to have a denominator of 12. We multiply both the numerator and denominator by 3:
24=2×34×3=612 \frac{2}{4} = \frac{2 \times 3}{4 \times 3} = \frac{6}{12} .
- Convert 26 \frac{2}{6} to have a denominator of 12. We multiply both the numerator and denominator by 2:
26=2×26×2=412 \frac{2}{6} = \frac{2 \times 2}{6 \times 2} = \frac{4}{12} .

Step 3: Subtract the fractions:
612412=6412=212 \frac{6}{12} - \frac{4}{12} = \frac{6 - 4}{12} = \frac{2}{12} .

Step 4: Simplify the result:
The fraction 212 \frac{2}{12} simplifies to 16 \frac{1}{6} by dividing both numerator and denominator by their greatest common divisor, which is 2.

Therefore, the solution to the problem is 16 \frac{1}{6} .

Answer

16 \frac{1}{6}

Exercise #10

Solve the following exercise:

2426=? \frac{2}{4}-\frac{2}{6}=\text{?}

Video Solution

Step-by-Step Solution

To solve the problem 2426\frac{2}{4} - \frac{2}{6}, let's follow these steps:

  • Step 1: Find the least common denominator (LCD) for the fractions. The denominators are 4 and 6, and the LCM of 4 and 6 is 12.
  • Step 2: Convert each fraction to an equivalent fraction with a denominator of 12.

First, convert 24\frac{2}{4}:

24=2×34×3=612\frac{2}{4} = \frac{2 \times 3}{4 \times 3} = \frac{6}{12}

Next, convert 26\frac{2}{6}:

26=2×26×2=412\frac{2}{6} = \frac{2 \times 2}{6 \times 2} = \frac{4}{12}

  • Step 3: Subtract the fractions with the common denominator.

612412=6412=212\frac{6}{12} - \frac{4}{12} = \frac{6 - 4}{12} = \frac{2}{12}

  • Step 4: Simplify the result, if possible.

212\frac{2}{12} simplifies to 16\frac{1}{6} by dividing both the numerator and the denominator by their greatest common divisor, which is 2.

Therefore, the solution to the problem is 16\frac{1}{6}.

Answer

16 \frac{1}{6}

Exercise #11

Solve the following exercise:

3416=? \frac{3}{4}-\frac{1}{6}=\text{?}

Video Solution

Step-by-Step Solution

To solve the problem of subtracting the fractions 34 \frac{3}{4} and 16 \frac{1}{6} , we follow these steps:

  • First, identify the least common denominator (LCD) of the given fractions' denominators. The numbers 4 and 6 have an LCD of 12.
  • Next, convert each fraction to have this common denominator.

The fraction 34 \frac{3}{4} is converted by determining what number we multiply 4 by to get 12 (which is 3). Thus, multiply both the numerator and the denominator by 3:
34=3×34×3=912 \frac{3}{4} = \frac{3 \times 3}{4 \times 3} = \frac{9}{12} .

The fraction 16 \frac{1}{6} is converted by determining what number we multiply 6 by to get 12 (which is 2). Hence, multiply both the numerator and the denominator by 2:
16=1×26×2=212 \frac{1}{6} = \frac{1 \times 2}{6 \times 2} = \frac{2}{12} .

  • Now that both fractions have the common denominator, subtract the numerators:

912212=9212=712 \frac{9}{12} - \frac{2}{12} = \frac{9 - 2}{12} = \frac{7}{12} .

The solution is the fraction 712 \frac{7}{12} .

In conclusion, the answer to this problem is 712 \frac{7}{12} .

Answer

712 \frac{7}{12}

Exercise #12

Solve the following exercise:

3436=? \frac{3}{4}-\frac{3}{6}=\text{?}

Video Solution

Step-by-Step Solution

To solve the problem 3436 \frac{3}{4} - \frac{3}{6} , follow these steps:

Step 1: Identify the denominators: 4 and 6.

Step 2: Find the Least Common Multiple (LCM) of 4 and 6. The LCM of 4 and 6 is 12, as 12 is the smallest number that both 4 and 6 divide into evenly.

Step 3: Convert each fraction to an equivalent fraction with a denominator of 12:
34 \frac{3}{4} needs to be converted. Multiply both the numerator and denominator by 3 to obtain 912 \frac{9}{12} .
36 \frac{3}{6} also needs conversion. Multiply both the numerator and denominator by 2 to obtain 612 \frac{6}{12} .

Step 4: Subtract the fractions:
912612=312 \frac{9}{12} - \frac{6}{12} = \frac{3}{12} .

Step 5: Simplify the resulting fraction if possible.
The fraction 312 \frac{3}{12} can be simplified to 14 \frac{1}{4} by dividing both the numerator and the denominator by their greatest common divisor, 3.

Therefore, the solution to the problem is 14 \frac{1}{4} .

Answer

14 \frac{1}{4}

Exercise #13

Solve the following exercise:

35310=? \frac{3}{5}-\frac{3}{10}=\text{?}

Video Solution

Step-by-Step Solution

To solve the problem 35310\frac{3}{5} - \frac{3}{10}, follow these steps:

  • Step 1: Find the common denominator:
  • The denominators are 5 and 10. The least common multiple (LCM) of 5 and 10 is 10, so our common denominator is 10.

  • Step 2: Convert each fraction to have the common denominator:
  • Convert 35\frac{3}{5} to a fraction with a denominator of 10:

    Multiply both the numerator and denominator of 35\frac{3}{5} by 2 to get 610\frac{6}{10}.

    Note: 310\frac{3}{10} already has the common denominator of 10, so it remains unchanged.

  • Step 3: Perform the subtraction:
  • Subtract 310\frac{3}{10} from 610\frac{6}{10}:

    610310=6310=310\frac{6}{10} - \frac{3}{10} = \frac{6 - 3}{10} = \frac{3}{10}.

    Therefore, the solution to the problem is 310\frac{3}{10}.

Answer

310 \frac{3}{10}

Exercise #14

Solve the following exercise:

45610=? \frac{4}{5}-\frac{6}{10}=\text{?}

Video Solution

Step-by-Step Solution

To solve the problem of subtracting the fraction 610 \frac{6}{10} from 45 \frac{4}{5} , follow these steps:

Step 1: Identify the least common multiple (LCM) of the denominators 5 and 10.
The LCM of 5 and 10 is 10.

Step 2: Convert each fraction to an equivalent fraction with the common denominator of 10.
- The fraction 45 \frac{4}{5} can be converted to have a denominator of 10 by multiplying both the numerator and the denominator by 2. Thus, 45=4×25×2=810 \frac{4}{5} = \frac{4 \times 2}{5 \times 2} = \frac{8}{10} .
- The fraction 610 \frac{6}{10} already has the denominator of 10, so it remains 610 \frac{6}{10} .

Step 3: Subtract the second fraction from the first.
Subtract the numerators while keeping the common denominator: 810610=8610=210 \frac{8}{10} - \frac{6}{10} = \frac{8 - 6}{10} = \frac{2}{10} .

Step 4: Simplify the resulting fraction.
The fraction 210 \frac{2}{10} can be simplified by dividing both the numerator and the denominator by their greatest common divisor, which is 2: 210=2÷210÷2=15 \frac{2}{10} = \frac{2 \div 2}{10 \div 2} = \frac{1}{5} .

Therefore, the solution to the problem is 15 \frac{1}{5} , which corresponds to choice number 2.

Answer

15 \frac{1}{5}

Exercise #15

Solve the following exercise:

4639=? \frac{4}{6}-\frac{3}{9}=\text{?}

Video Solution

Step-by-Step Solution

To solve this problem, let's go step by step:

  • Step 1: Identify the Least Common Denominator (LCD).
    • The denominators are 6 and 9.
    • The multiples of 6 are 6, 12, 18, 24, ...
    • The multiples of 9 are 9, 18, 27, 36, ...
    • The smallest common multiple is 18.
  • Step 2: Rewrite the fractions with the common denominator of 18.
    • 46 \frac{4}{6} can be converted by finding an equivalent fraction with a denominator of 18: 4×36×3=1218\frac{4 \times 3}{6 \times 3} = \frac{12}{18}.
    • 39 \frac{3}{9} can be converted similarly: 3×29×2=618\frac{3 \times 2}{9 \times 2} = \frac{6}{18}.
  • Step 3: Subtract the two fractions.
    • Subtract the numerators: 126=612 - 6 = 6.
    • The result is 618\frac{6}{18}.
  • Step 4: Simplify the resulting fraction.
    • 618\frac{6}{18} simplifies to 13\frac{1}{3} by dividing both the numerator and the denominator by 6.

Therefore, the solution to the problem is 13 \frac{1}{3} .

Answer

13 \frac{1}{3}

Exercise #16

Solve the following exercise:

51014=? \frac{5}{10}-\frac{1}{4}=\text{?}

Video Solution

Step-by-Step Solution

To solve the problem 51014 \frac{5}{10} - \frac{1}{4} , we need to subtract two fractions. We will accomplish this by finding a common denominator.

Let's begin by finding the least common multiple (LCM) of the denominators 10 and 4:

  • List the multiples of 10: 10, 20, 30, 40, ...
  • List the multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, ...
  • The smallest common multiple is 20, so 20 is the least common denominator.

Now, convert both fractions to have the common denominator of 20:

  • For 510 \frac{5}{10} , multiply both the numerator and the denominator by 2 to get an equivalent fraction: 5×210×2=1020 \frac{5 \times 2}{10 \times 2} = \frac{10}{20} .
  • For 14 \frac{1}{4} , multiply both the numerator and the denominator by 5 to get an equivalent fraction: 1×54×5=520 \frac{1 \times 5}{4 \times 5} = \frac{5}{20} .

We can now subtract the fractions:

  • Subtract the numerators: 1020520=10520=520 \frac{10}{20} - \frac{5}{20} = \frac{10 - 5}{20} = \frac{5}{20} .

Simplify 520 \frac{5}{20} by dividing both the numerator and the denominator by their greatest common divisor, which is 5:

  • So, 520=5÷520÷5=14 \frac{5}{20} = \frac{5 \div 5}{20 \div 5} = \frac{1}{4} .

Therefore, the solution to the problem is 14 \frac{1}{4} .

The correct answer choice is 4, which represents the simplified solution.

Answer

14 \frac{1}{4}

Exercise #17

Solve the following exercise:

51026=? \frac{5}{10}-\frac{2}{6}=\text{?}

Video Solution

Step-by-Step Solution

We need to subtract the fractions 51026 \frac{5}{10} - \frac{2}{6} .

Step 1: Find a common denominator for the fractions. The denominators are 10 and 6.

  • The Least Common Multiple (LCM) of 10 and 6 is 30.

Step 2: Convert each fraction to an equivalent fraction with the common denominator of 30.

  • For 510 \frac{5}{10} , multiply both the numerator and the denominator by 3 to get 1530 \frac{15}{30} .
  • For 26 \frac{2}{6} , multiply both the numerator and the denominator by 5 to get 1030 \frac{10}{30} .

Step 3: Subtract the fractions:

15301030=151030=530 \frac{15}{30} - \frac{10}{30} = \frac{15 - 10}{30} = \frac{5}{30} .

Step 4: Simplify the result:

The fraction 530 \frac{5}{30} can be simplified by dividing the numerator and denominator by their greatest common divisor, which is 5.

530=5÷530÷5=16 \frac{5}{30} = \frac{5 \div 5}{30 \div 5} = \frac{1}{6} .

Therefore, the answer to the subtraction 51026 \frac{5}{10} - \frac{2}{6} is 16 \frac{1}{6} .

Answer

16 \frac{1}{6}

Exercise #18

Solve the following exercise:

58310=? \frac{5}{8}-\frac{3}{10}=\text{?}

Video Solution

Step-by-Step Solution

To solve the subtraction problem 58310\frac{5}{8} - \frac{3}{10}, we first need to find a common denominator for the fractions.

  • Step 1: Determine the least common multiple (LCM) of the denominators 8 and 10.

To find the LCM of 8 and 10, list their multiples:

Multiples of 8: 8,16,24,32,40,8, 16, 24, 32, 40, \ldots
Multiples of 10: 10,20,30,40,50,10, 20, 30, 40, 50, \ldots

The smallest common multiple is 40. Therefore, the common denominator is 40.

  • Step 2: Adjust each fraction to the common denominator of 40.

Convert 58\frac{5}{8} to a fraction with a denominator of 40:

58=5×58×5=2540\frac{5}{8} = \frac{5 \times 5}{8 \times 5} = \frac{25}{40}

Convert 310\frac{3}{10} to a fraction with a denominator of 40:

310=3×410×4=1240\frac{3}{10} = \frac{3 \times 4}{10 \times 4} = \frac{12}{40}

  • Step 3: Subtract the fractions.

Subtract the numerators and place the result over the common denominator:

25401240=251240=1340\frac{25}{40} - \frac{12}{40} = \frac{25 - 12}{40} = \frac{13}{40}

The result is 1340\frac{13}{40}, which is already in its simplest form.

The solution to the problem is 1340\frac{13}{40}.

Answer

1340 \frac{13}{40}

Exercise #19

Solve the following exercise:

71026=? \frac{7}{10}-\frac{2}{6}=\text{?}

Video Solution

Step-by-Step Solution

To solve the problem 71026 \frac{7}{10} - \frac{2}{6} , we need to follow these steps:

  • Find the Least Common Denominator (LCD) for the denominators 10 and 6. The LCD of 10 and 6 is 30.
  • Convert each fraction to have the common denominator of 30:
    • 710=7×310×3=2130\frac{7}{10} = \frac{7 \times 3}{10 \times 3} = \frac{21}{30}
    • 26=2×56×5=1030\frac{2}{6} = \frac{2 \times 5}{6 \times 5} = \frac{10}{30}
  • Subtract the two fractions:
    • 21301030=211030=1130\frac{21}{30} - \frac{10}{30} = \frac{21 - 10}{30} = \frac{11}{30}

Therefore, the solution to the problem is 1130 \frac{11}{30} .

Answer

1130 \frac{11}{30}

Exercise #20

Solve the following exercise:

78512=? \frac{7}{8}-\frac{5}{12}=\text{?}

Video Solution

Step-by-Step Solution

To solve the problem of subtracting 512\frac{5}{12} from 78\frac{7}{8}, we follow these steps:

  • Step 1: Find the least common multiple (LCM) of the denominators 8 and 12. The multiples of 8 are 8, 16, 24, 32, and those of 12 are 12, 24, 36. The smallest common multiple is 24.
  • Step 2: Convert each fraction to have a denominator of 24.
    For 78\frac{7}{8}:
    Multiply the numerator and the denominator by 3 to get: 7×38×3=2124\frac{7 \times 3}{8 \times 3} = \frac{21}{24}.
    For 512\frac{5}{12}:
    Multiply the numerator and the denominator by 2 to get: 5×212×2=1024\frac{5 \times 2}{12 \times 2} = \frac{10}{24}.
  • Step 3: Subtract the fractions now that they have the same denominator:
    21241024=211024=1124\frac{21}{24} - \frac{10}{24} = \frac{21 - 10}{24} = \frac{11}{24}.
  • Step 4: Simplify the fraction if possible. In this case, 1124\frac{11}{24} is already in its simplest form.

Therefore, the result of 78512\frac{7}{8} - \frac{5}{12} is 1124\frac{11}{24}.

Answer

1124 \frac{11}{24}