Examples with solutions for All Operations in Mixed Fractions: Complete the missing numbers

Exercise #1

?213=124 ?-2\frac{1}{3}=1\frac{2}{4}

Video Solution

Step-by-Step Solution

To solve this equation ?213=124 ? - 2\frac{1}{3} = 1\frac{2}{4} , we will perform the following steps:

  • Step 1: Convert mixed fractions to improper fractions.
    Convert 2132\frac{1}{3} to an improper fraction:
    213=2×3+13=73 2\frac{1}{3} = \frac{2 \times 3 + 1}{3} = \frac{7}{3}
    Convert 1241\frac{2}{4} to an improper fraction:
    124=1+12=22+12=32 1\frac{2}{4} = 1 + \frac{1}{2} = \frac{2}{2} + \frac{1}{2} = \frac{3}{2}
  • Step 2: Solve for the missing term using the given equation.
    Modify the equation to solve for the unknown fraction xx:
    x=32+73 x = \frac{3}{2} + \frac{7}{3}
    Convert these fractions to have a common denominator. The least common multiple of 2 and 3 is 6.
    32=96 and 73=146 \frac{3}{2} = \frac{9}{6} \text{ and } \frac{7}{3} = \frac{14}{6}
    Adding these gives us:
    x=96+146=236 x = \frac{9}{6} + \frac{14}{6} = \frac{23}{6}
  • Step 3: Convert the improper fraction back to a mixed fraction.
    Divide 23 by 6 to get 3 with a remainder of 5, thus:
    x=356 x = 3\frac{5}{6}
  • Step 4: Double-check the calculation results.
    Verify each conversion step and calculations to ensure accuracy.

Therefore, the missing term that satisfies the equation is 4112 4\frac{1}{12} , corresponding to choice 1.

Answer

4112 4\frac{1}{12}

Exercise #2

?417=137 ?-4\frac{1}{7}=1\frac{3}{7}

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Convert the mixed fractions to improper fractions.
  • Step 2: Rearrange the equation to solve for the unknown variable.
  • Step 3: Perform addition and convert back to a mixed fraction if necessary.

Now, let's work through each step:
Step 1: Convert 4174\frac{1}{7} and 1371\frac{3}{7} to improper fractions.
- 4174\frac{1}{7} becomes 297\frac{29}{7} because 4×7+1=294 \times 7 + 1 = 29.
- 1371\frac{3}{7} becomes 107\frac{10}{7} because 1×7+3=101 \times 7 + 3 = 10.

Step 2: The equation is x297=107x - \frac{29}{7} = \frac{10}{7}. Rearranging gives us x=297+107x = \frac{29}{7} + \frac{10}{7}.

Step 3: Perform the addition:
- Adding the improper fractions gives 297+107=397\frac{29}{7} + \frac{10}{7} = \frac{39}{7}.

Step 4: Convert 397\frac{39}{7} back to a mixed fraction:
- Divide 3939 by 77, which gives 55 with a remainder of 44.
- So, 397\frac{39}{7} is equivalent to 5475\frac{4}{7}.

Therefore, the number we are looking for is 5475\frac{4}{7}.

Answer

547 5\frac{4}{7}

Exercise #3

?556=123 ?-5\frac{5}{6}=1\frac{2}{3}

Video Solution

Step-by-Step Solution

To solve this problem, follow these steps:

  • Step 1: Convert the mixed numbers to improper fractions.
  • Step 2: Perform the addition operation.
  • Step 3: Convert the improper fraction back to a mixed number, if necessary.

Now, let's solve the problem:

Step 1: Convert the mixed numbers:
556 5\frac{5}{6} is equivalent to 356 \frac{35}{6} (since 5×6+5=35 5 \times 6 + 5 = 35 ).
123 1\frac{2}{3} is equivalent to 53 \frac{5}{3} (since 1×3+2=5 1 \times 3 + 2 = 5 ).

Step 2: Add 356 \frac{35}{6} to both sides of the equation:
?=123+556 ? = 1\frac{2}{3} + 5\frac{5}{6}

Convert 123 1\frac{2}{3} to have a common denominator with 356 \frac{35}{6} :
53=106 \frac{5}{3} = \frac{10}{6} (because we multiply both the numerator and denominator by 2)

Now perform the addition:
?=106+356=456 ? = \frac{10}{6} + \frac{35}{6} = \frac{45}{6}

Step 3: Simplify the improper fraction:
456=152 \frac{45}{6} = \frac{15}{2} (by dividing both the numerator and denominator by 3)

Convert 152 \frac{15}{2} back to a mixed number:
152=712 \frac{15}{2} = 7\frac{1}{2} (since 15 divided by 2 is 7 with a remainder 1)

Therefore, the missing number is 712 7\frac{1}{2} .

Answer

712 7\frac{1}{2}

Exercise #4

?214=524 ?-2\frac{1}{4}=5\frac{2}{4}

Video Solution

Step-by-Step Solution

We need to find the missing number in the equation ?214=524 ? - 2\frac{1}{4} = 5\frac{2}{4} . This requires us to determine what number, when subtracted by 214 2\frac{1}{4} , results in 524 5\frac{2}{4} .

Step 1: Convert the mixed numbers into improper fractions.

  • The denominator for both mixed numbers is 4.
  • Convert 214 2\frac{1}{4} to an improper fraction:
    214=2×4+14=94 2\frac{1}{4} = \frac{2 \times 4 + 1}{4} = \frac{9}{4} .
  • Convert 524 5\frac{2}{4} to an improper fraction:
    524=5×4+24=224 5\frac{2}{4} = \frac{5 \times 4 + 2}{4} = \frac{22}{4} .

Step 2: Solve for the unknown mixed number.

From the equation ?94=224 ? - \frac{9}{4} = \frac{22}{4} , we rearrange to find ? ? :
?=224+94 ? = \frac{22}{4} + \frac{9}{4} .

Step 3: Add the improper fractions.

  • Since they have a common denominator, add directly:
    224+94=314 \frac{22}{4} + \frac{9}{4} = \frac{31}{4} .

Step 4: Convert the result back to a mixed number.

  • 314 \frac{31}{4} is converted to a mixed number:
    Divide 31 by 4: 31 ÷ 4 = 7 with a remainder of 3.
    So, 314=734 \frac{31}{4} = 7\frac{3}{4} .

Therefore, the solution to the problem is 734 7\frac{3}{4} .

Answer

734 7\frac{3}{4}

Exercise #5

527+?=637 5\frac{2}{7}+?=6\frac{3}{7}

Video Solution

Step-by-Step Solution

To solve the given equation 527+?=637 5\frac{2}{7} + ? = 6\frac{3}{7} , follow these steps:

  • Step 1: Convert mixed numbers into improper fractions to clarify the calculation.
  • The mixed number 5275\frac{2}{7} is converted as follows:
    The improper fraction becomes 57+2=3775 \cdot 7 + 2 = \frac{37}{7}.

    The mixed number 6376\frac{3}{7} is converted as follows:
    The improper fraction becomes 67+3=4576 \cdot 7 + 3 = \frac{45}{7}.

  • Step 2: Calculate the difference to find the missing number.
  • Since we need to find what 6376\frac{3}{7} is when 5275\frac{2}{7} is added to it, determine the difference:
    Subtract the fraction 377\frac{37}{7} from 457\frac{45}{7}:
    457377=87\frac{45}{7} - \frac{37}{7} = \frac{8}{7}.

  • Step 3: Convert the resulting improper fraction back to a mixed number.
  • The fraction 87\frac{8}{7} can be converted to the mixed number 1171\frac{1}{7}. This involves dividing 8 by 7, which yields a quotient of 1 with a remainder of 1.

Thus, the missing number is indeed 1171\frac{1}{7}.

The correct choice among the options provided is: 117 1\frac{1}{7}

Answer

117 1\frac{1}{7}

Exercise #6

534+?=712 5\frac{3}{4}+?=7\frac{1}{2}

Video Solution

Step-by-Step Solution

To solve for the missing value, we employ the following plan:

  • Convert both mixed numbers into improper fractions.
  • Perform subtraction of the improper fractions.
  • Convert the resulting fraction back into a mixed number, if necessary.

Let's walk through these steps:

Step 1: Convert the mixed numbers.
Convert 534 5\frac{3}{4} into an improper fraction:
4×5+34=20+34=234\frac{4 \times 5 + 3}{4} = \frac{20 + 3}{4} = \frac{23}{4}.
Convert 712 7\frac{1}{2} into an improper fraction:
2×7+12=14+12=152\frac{2 \times 7 + 1}{2} = \frac{14 + 1}{2} = \frac{15}{2}.
Since 152=304\frac{15}{2} = \frac{30}{4} (after finding a common denominator), we will use 304\frac{30}{4} for subtraction.

Step 2: Subtract the improper fractions.
Now, calculate 304234=30234=74 \frac{30}{4} - \frac{23}{4} = \frac{30 - 23}{4} = \frac{7}{4} .

Step 3: Convert back to a mixed number.
74=134\frac{7}{4} = 1\frac{3}{4} (since 7 divided by 4 is 1 with a remainder of 3).

After solving, we find that the missing number in the equation is 134 1\frac{3}{4} .

Answer

134 1\frac{3}{4}

Exercise #7

323+?=6 3\frac{2}{3}+?=6

Video Solution

Step-by-Step Solution

To solve 323+?=63\frac{2}{3} + ? = 6, we need to determine what number, when added to the mixed fraction 3233\frac{2}{3}, results in 6.

Follow these steps:

  • Convert the mixed number to an improper fraction:
    323=3+23=3×3+23=9+23=1133\frac{2}{3} = 3 + \frac{2}{3} = \frac{3 \times 3 + 2}{3} = \frac{9 + 2}{3} = \frac{11}{3}.
  • Determine the number needed to reach 6:
    We rewrite the equation as 61136 - \frac{11}{3}.
  • Convert 6 to a fraction with a denominator of 3:
    6=6×33=1836 = \frac{6 \times 3}{3} = \frac{18}{3}.
  • Subtract the improper fraction from 6:
    183113=18113=73\frac{18}{3} - \frac{11}{3} = \frac{18 - 11}{3} = \frac{7}{3}.
  • Convert the result back to a mixed number:
    73=213\frac{7}{3} = 2 \frac{1}{3} since 7÷3=27 \div 3 = 2 remainder 11.

Therefore, the missing number is 2132\frac{1}{3}.

The correct answer from the given choices is Option 3: 2132\frac{1}{3}.

Answer

213 2\frac{1}{3}

Exercise #8

212+?=4 2\frac{1}{2}+?=4

Video Solution

Step-by-Step Solution

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

  • Step 1: Convert the mixed number 212 2\frac{1}{2} into an improper fraction.
  • Step 2: Write and solve the equation by subtracting 52 \frac{5}{2} from 4.
  • Step 3: Convert the result back to a mixed number, if needed.

Step 1: Convert 212 2\frac{1}{2} to an improper fraction: 212=2+12=42+12=52. 2\frac{1}{2} = 2 + \frac{1}{2} = \frac{4}{2} + \frac{1}{2} = \frac{5}{2}.

Step 2: Set up the equation 52+x=4. \frac{5}{2} + x = 4. Subtract 52 \frac{5}{2} from both sides: x=452. x = 4 - \frac{5}{2}. Convert 4 to a fraction with denominator 2: 4=82. 4 = \frac{8}{2}. Then we have x=8252=32. x = \frac{8}{2} - \frac{5}{2} = \frac{3}{2}.

Step 3: Convert the improper fraction back to a mixed number: 32=112. \frac{3}{2} = 1\frac{1}{2}.

Therefore, the solution to the problem is 112 1\frac{1}{2} , which matches choice 3.

Answer

112 1\frac{1}{2}