Examples with solutions for Common Denominators: One of the denominators is the common denominator

Exercise #1

14+58= \frac{1}{4}+\frac{5}{8}=

Video Solution

Step-by-Step Solution

Let's try to find the least common multiple between 8 and 4

To find the least common multiple, we need to find a number that is divisible by both 8 and 4

In this case, the common multiple is 8

Now we'll multiply each fraction by the appropriate number to reach the denominator 8

We'll multiply the first fraction by 2

We'll multiply the second fraction by 1

1×24×2+5×18×1=28+58 \frac{1\times2}{4\times2}+\frac{5\times1}{8\times1}=\frac{2}{8}+\frac{5}{8}

Now we'll combine and get:

2+58=78 \frac{2+5}{8}=\frac{7}{8}

Answer

78 \frac{7}{8}

Exercise #2

24+12= \frac{2}{4}+\frac{1}{2}=

Video Solution

Step-by-Step Solution

Let's try to find the lowest common denominator between 4 and 2

To find the lowest common denominator, we need to find a number that is divisible by both 4 and 2

In this case, the common denominator is 4

Now we'll multiply each fraction by the appropriate number to reach the denominator 4

We'll multiply the first fraction by 1

We'll multiply the second fraction by 2

2×14×1+1×22×2=24+24 \frac{2\times1}{4\times1}+\frac{1\times2}{2\times2}=\frac{2}{4}+\frac{2}{4}

Now we'll combine and get:

2+24=44=1 \frac{2+2}{4}=\frac{4}{4}=1

Answer

1 1

Exercise #3

12+38= \frac{1}{2}+\frac{3}{8}=

Video Solution

Step-by-Step Solution

Let's try to find the lowest common denominator between 2 and 8

To find the lowest common denominator, we need to find a number that is divisible by both 2 and 8

In this case, the common denominator is 8

Now we'll multiply each fraction by the appropriate number to reach the denominator 8

We'll multiply the first fraction by 4

We'll multiply the second fraction by 1

1×42×4+3×18×1=48+38 \frac{1\times4}{2\times4}+\frac{3\times1}{8\times1}=\frac{4}{8}+\frac{3}{8}

Now we'll combine and get:

4+38=78 \frac{4+3}{8}=\frac{7}{8}

Answer

78 \frac{7}{8}

Exercise #4

13+49= \frac{1}{3}+\frac{4}{9}=

Video Solution

Step-by-Step Solution

Let's try to find the lowest common denominator between 3 and 9

To find the lowest common denominator, we need to find a number that is divisible by both 3 and 9

In this case, the common denominator is 9

Now we'll multiply each fraction by the appropriate number to reach the denominator 9

We'll multiply the first fraction by 3

We'll multiply the second fraction by 1

1×33×3+4×19×1=39+49 \frac{1\times3}{3\times3}+\frac{4\times1}{9\times1}=\frac{3}{9}+\frac{4}{9}

Now we'll combine and get:

3+49=79 \frac{3+4}{9}=\frac{7}{9}

Answer

79 \frac{7}{9}

Exercise #5

23+16= \frac{2}{3}+\frac{1}{6}=

Video Solution

Step-by-Step Solution

Let's try to find the lowest common denominator between 3 and 6

To find the lowest common denominator, we need to find a number that is divisible by both 3 and 6

In this case, the common denominator is 6

Now we'll multiply each fraction by the appropriate number to reach the denominator 6

We'll multiply the first fraction by 2

We'll multiply the second fraction by 1

2×23×2+1×16×1=46+16 \frac{2\times2}{3\times2}+\frac{1\times1}{6\times1}=\frac{4}{6}+\frac{1}{6}

Now we'll combine and get:

4+16=56 \frac{4+1}{6}=\frac{5}{6}

Answer

56 \frac{5}{6}

Exercise #6

24+18= \frac{2}{4}+\frac{1}{8}=

Video Solution

Step-by-Step Solution

Let's try to find the lowest common denominator between 4 and 8

To find the lowest common denominator, we need to find a number that is divisible by both 4 and 8

In this case, the common denominator is 8

Now we'll multiply each fraction by the appropriate number to reach the denominator 8

We'll multiply the first fraction by 2

We'll multiply the second fraction by 1

2×24×2+1×18×1=48+18 \frac{2\times2}{4\times2}+\frac{1\times1}{8\times1}=\frac{4}{8}+\frac{1}{8}

Now we'll combine and get:

4+18=58 \frac{4+1}{8}=\frac{5}{8}

Answer

58 \frac{5}{8}

Exercise #7

15+610= \frac{1}{5}+\frac{6}{10}=

Video Solution

Step-by-Step Solution

Let's try to find the least common denominator between 5 and 10

To find the least common denominator, we need to find a number that is divisible by both 5 and 10

In this case, the common denominator is 10

Now we'll multiply each fraction by the appropriate number to reach the denominator 10

We'll multiply the first fraction by 2

We'll multiply the second fraction by 1

1×25×2+6×110×1=210+610 \frac{1\times2}{5\times2}+\frac{6\times1}{10\times1}=\frac{2}{10}+\frac{6}{10}

Now we'll combine and get:

2+610=810 \frac{2+6}{10}=\frac{8}{10}

Answer

810 \frac{8}{10}

Exercise #8

13+36= \frac{1}{3}+\frac{3}{6}=

Video Solution

Step-by-Step Solution

Let's try to find the least common denominator between 3 and 6

To find the least common denominator, we need to find a number that is divisible by both 3 and 6

In this case, the common denominator is 6

Now we'll multiply each fraction by the appropriate number to reach the denominator 6

We'll multiply the first fraction by 2

We'll multiply the second fraction by 1

1×23×2+3×16×1=26+36 \frac{1\times2}{3\times2}+\frac{3\times1}{6\times1}=\frac{2}{6}+\frac{3}{6}

Now we'll combine and get:

2+36=56 \frac{2+3}{6}=\frac{5}{6}

Answer

56 \frac{5}{6}

Exercise #9

34+18= \frac{3}{4}+\frac{1}{8}=

Video Solution

Step-by-Step Solution

Let's try to find the least common denominator between 4 and 8

To find the least common denominator, we need to find a number that is divisible by both 4 and 8

In this case, the common denominator is 8

Now we'll multiply each fraction by the appropriate number to reach the denominator 8

We'll multiply the first fraction by 2

We'll multiply the second fraction by 1

3×24×2+1×18×1=68+18 \frac{3\times2}{4\times2}+\frac{1\times1}{8\times1}=\frac{6}{8}+\frac{1}{8}

Now we'll combine and get:

6+18=78 \frac{6+1}{8}=\frac{7}{8}

Answer

78 \frac{7}{8}

Exercise #10

14+612= \frac{1}{4}+\frac{6}{12}=

Video Solution

Step-by-Step Solution

Let's try to find the least common denominator between 4 and 12

To find the least common denominator, we need to find a number that is divisible by both 4 and 12

In this case, the common denominator is 12

Now we'll 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 1

1×34×3+6×112×1=312+612 \frac{1\times3}{4\times3}+\frac{6\times1}{12\times1}=\frac{3}{12}+\frac{6}{12}

Now we'll combine and get:

3+612=912 \frac{3+6}{12}=\frac{9}{12}

Answer

912 \frac{9}{12}

Exercise #11

26+412= \frac{2}{6}+\frac{4}{12}=

Video Solution

Step-by-Step Solution

Let's try to find the least common multiple between 6 and 12

To find the least common multiple, we need to find a number that is divisible by both 6 and 12

In this case, the least common multiple is 12

Now we'll 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 1

2×26×2+4×112×1=412+412 \frac{2\times2}{6\times2}+\frac{4\times1}{12\times1}=\frac{4}{12}+\frac{4}{12}

Now we'll combine and get:

4+412=812 \frac{4+4}{12}=\frac{8}{12}

Answer

812 \frac{8}{12}

Exercise #12

13+29= \frac{1}{3}+\frac{2}{9}=

Video Solution

Step-by-Step Solution

Let's try to find the lowest common denominator between 3 and 9

To find the lowest common denominator, we need to find a number that is divisible by both 3 and 9

In this case, the common denominator is 9

Now we'll multiply each fraction by the appropriate number to reach the denominator 9

We'll multiply the first fraction by 3

We'll multiply the second fraction by 1

1×33×3+2×19×1=29+29 \frac{1\times3}{3\times3}+\frac{2\times1}{9\times1}=\frac{2}{9}+\frac{2}{9}

Now we'll combine and get:

2+39=59 \frac{2+3}{9}=\frac{5}{9}

Answer

59 \frac{5}{9}

Exercise #13

35+215= \frac{3}{5}+\frac{2}{15}=

Video Solution

Step-by-Step Solution

Let's try to find the lowest common denominator between 5 and 15

To find the lowest common denominator, we need to find a number that is divisible by both 5 and 15

In this case, the common denominator is 15

Now we'll multiply each fraction by the appropriate number to reach the denominator 15

We'll multiply the first fraction by 3

We'll multiply the second fraction by 1

3×35×3+2×115×1=915+215 \frac{3\times3}{5\times3}+\frac{2\times1}{15\times1}=\frac{9}{15}+\frac{2}{15}

Now we'll combine and get:

9+215=1115 \frac{9+2}{15}=\frac{11}{15}

Answer

1115 \frac{11}{15}

Exercise #14

12+210= \frac{1}{2}+\frac{2}{10}=

Video Solution

Step-by-Step Solution

Let's try to find the lowest common denominator between 2 and 10

To find the lowest common denominator, we need to find a number that is divisible by both 2 and 10

In this case, the common denominator is 10

Now we'll multiply each fraction by the appropriate number to reach the denominator 10

We'll multiply the first fraction by 5

We'll multiply the second fraction by 1

1×52×5+2×110×1=510+210 \frac{1\times5}{2\times5}+\frac{2\times1}{10\times1}=\frac{5}{10}+\frac{2}{10}

Now we'll combine and get:

5+210=710 \frac{5+2}{10}=\frac{7}{10}

Answer

710 \frac{7}{10}

Exercise #15

14+68= \frac{1}{4}+\frac{6}{8}=

Video Solution

Step-by-Step Solution

Let's try to find the least common denominator between 4 and 8

To find the least common denominator, we need to find a number that is divisible by both 4 and 8

In this case, the common denominator is 8

Now we'll multiply each fraction by the appropriate number to reach the denominator 8

We'll multiply the first fraction by 2

We'll multiply the second fraction by 1

1×24×2+6×18×1=28+68 \frac{1\times2}{4\times2}+\frac{6\times1}{8\times1}=\frac{2}{8}+\frac{6}{8}

Now we'll combine and get:

2+68=88=1 \frac{2+6}{8}=\frac{8}{8}=1

Answer

1 1

Exercise #16

13+59= \frac{1}{3}+\frac{5}{9}=

Video Solution

Step-by-Step Solution

Let's try to find the lowest common denominator between 3 and 9

To find the lowest common denominator, we need to find a number that is divisible by both 3 and 9

In this case, the common denominator is 9

Now we'll multiply each fraction by the appropriate number to reach the denominator 9

We'll multiply the first fraction by 3

We'll multiply the second fraction by 1

1×33×3+5×19×1=39+59 \frac{1\times3}{3\times3}+\frac{5\times1}{9\times1}=\frac{3}{9}+\frac{5}{9}

Now we'll combine and get:

3+59=89 \frac{3+5}{9}=\frac{8}{9}

Answer

89 \frac{8}{9}

Exercise #17

15+215= \frac{1}{5}+\frac{2}{15}=

Video Solution

Step-by-Step Solution

Let's try to find the lowest common denominator between 5 and 15

To find the lowest common denominator, we need to find a number that is divisible by both 5 and 15

In this case, the common denominator is 15

Now we'll multiply each fraction by the appropriate number to reach the denominator 15

We'll multiply the first fraction by 3

We'll multiply the second fraction by 1

1×35×3+2×115×1=315+215 \frac{1\times3}{5\times3}+\frac{2\times1}{15\times1}=\frac{3}{15}+\frac{2}{15}

Now we'll combine and get:

3+215=515 \frac{3+2}{15}=\frac{5}{15}

Answer

515 \frac{5}{15}

Exercise #18

12+310= \frac{1}{2}+\frac{3}{10}=

Video Solution

Step-by-Step Solution

Let's try to find the least common denominator between 2 and 10

To find the least common denominator, we need to find a number that is divisible by both 2 and 10

In this case, the common denominator is 10

Now we'll multiply each fraction by the appropriate number to reach the denominator 10

We'll multiply the first fraction by 5

We'll multiply the second fraction by 1

1×52×5+3×110×1=510+310 \frac{1\times5}{2\times5}+\frac{3\times1}{10\times1}=\frac{5}{10}+\frac{3}{10}

Now we'll combine and get:

5+310=810 \frac{5+3}{10}=\frac{8}{10}

Answer

810 \frac{8}{10}

Exercise #19

14+48= \frac{1}{4}+\frac{4}{8}=

Video Solution

Step-by-Step Solution

Let's try to find the lowest common denominator between 4 and 8

To find the lowest common denominator, we need to find a number that is divisible by both 4 and 8

In this case, the common denominator is 8

Now we'll multiply each fraction by the appropriate number to reach the denominator 8

We'll multiply the first fraction by 2

We'll multiply the second fraction by 1

1×24×2+4×18×1=28+48 \frac{1\times2}{4\times2}+\frac{4\times1}{8\times1}=\frac{2}{8}+\frac{4}{8}

Now we'll combine and get:

2+48=68 \frac{2+4}{8}=\frac{6}{8}

Answer

68 \frac{6}{8}

Exercise #20

45310= \frac{4}{5}-\frac{3}{10}=

Video Solution

Step-by-Step Solution

Let's try to find the least common denominator between 5 and 10

To find the least common denominator, we need to find a number that is divisible by both 5 and 10

In this case, the common denominator is 10

Now we'll multiply each fraction by the appropriate number to reach the denominator 10

We'll multiply the first fraction by 2

We'll multiply the second fraction by 1

4×25×23×110×1=810310 \frac{4\times2}{5\times2}-\frac{3\times1}{10\times1}=\frac{8}{10}-\frac{3}{10}

Now let's subtract:

8310=510 \frac{8-3}{10}=\frac{5}{10}

Answer

510 \frac{5}{10}