Examples with solutions for Addition of Fractions: One of the denominators is the common denominator

Exercise #1

Solve the following equation:

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

Video Solution

Step-by-Step Solution

We must first identify the lowest common denominator between 3 and 6.

In order to determine 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.

We'll then proceed to 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}

Finally we'll combine and obtain the following:

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

Answer

56 \frac{5}{6}

Exercise #2

Solve the following equation:

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

Video Solution

Step-by-Step Solution

Let's first identify the lowest common denominator between 2 and 8.

In order to determine the lowest common denominator, we need to first find a number that is divisible by both 2 and 8.

In this case, the common denominator is 8.

We'll then proceed to multiply each fraction by the appropriate number in order 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}

Finally we'll combine and obtain the following:

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

Answer

78 \frac{7}{8}

Exercise #3

Solve the following exercise:

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

Video Solution

Step-by-Step Solution

To solve the problem of adding 23 \frac{2}{3} and 16 \frac{1}{6} , we will first find a common denominator:

  • Step 1: Identify the least common denominator (LCD), which is 6 for the fractions 23 \frac{2}{3} and 16 \frac{1}{6} .
  • Step 2: Convert 23 \frac{2}{3} to an equivalent fraction with a denominator of 6. To do this, multiply both the numerator and the denominator by 2: 23=2×23×2=46 \frac{2}{3} = \frac{2 \times 2}{3 \times 2} = \frac{4}{6}
  • Step 3: Now, add the fractions 46 \frac{4}{6} and 16 \frac{1}{6} : 46+16=4+16=56 \frac{4}{6} + \frac{1}{6} = \frac{4 + 1}{6} = \frac{5}{6}

As we see, both fractions have been added correctly. The sum is already in its simplest form.

Therefore, the solution to the problem is 56 \frac{5}{6} .

Answer

56 \frac{5}{6}

Exercise #4

Solve the following exercise:

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

Video Solution

Step-by-Step Solution

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

  • Step 1: Convert 14 \frac{1}{4} to a fraction with a denominator of 8.
  • Step 2: Add the fractions.
  • Step 3: Simplify the result.

Now, let's work through each step:

Step 1: Convert 14 \frac{1}{4} to have a denominator of 8. Since 8÷4=2 8 \div 4 = 2 , multiply both the numerator and denominator of 14 \frac{1}{4} by 2:

14=1×24×2=28 \frac{1}{4} = \frac{1 \times 2}{4 \times 2} = \frac{2}{8}

Step 2: Now add 28 \frac{2}{8} and 48 \frac{4}{8} :

28+48=2+48=68 \frac{2}{8} + \frac{4}{8} = \frac{2 + 4}{8} = \frac{6}{8}

Step 3: Simplify 68 \frac{6}{8} if possible. The greatest common divisor of 6 and 8 is 2. So, 68 \frac{6}{8} simplifies to:

6÷28÷2=34 \frac{6 \div 2}{8 \div 2} = \frac{3}{4}

Therefore, the solution to the problem is 68 \frac{6}{8} .

Answer

68 \frac{6}{8}

Exercise #5

Solve the following exercise:

14+38=? \frac{1}{4}+\frac{3}{8}=\text{?}

Video Solution

Step-by-Step Solution

To solve this addition problem involving fractions, we first need to ensure both fractions have a common denominator.

Step 1: Convert 14 \frac{1}{4} to an equivalent fraction with a denominator of 8.

To do this, we need to multiply both the numerator and denominator of 14 \frac{1}{4} by 2 to achieve the desired denominator:

1×24×2=28 \frac{1 \times 2}{4 \times 2} = \frac{2}{8}

Step 2: Now we can add the fractions 28 \frac{2}{8} and 38 \frac{3}{8} since they have a common denominator.

28+38=2+38=58 \frac{2}{8} + \frac{3}{8} = \frac{2 + 3}{8} = \frac{5}{8}

Therefore, the sum of 14 \frac{1}{4} and 38 \frac{3}{8} is 58\frac{5}{8}.

Thus, the correct answer to the problem is 58 \frac{5}{8} .

Answer

58 \frac{5}{8}

Exercise #6

Solve the following equation:

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

Video Solution

Step-by-Step Solution

We must first identify the lowest common denominator between 4 and 8

In order to determine 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.

We will proceed to 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}

Finally we'll combine and obtain the following:

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

Answer

58 \frac{5}{8}

Exercise #7

Solve the following equation:

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

Video Solution

Step-by-Step Solution

Let's begin by identifying the lowest common denominator between 3 and 6.

In order to determine 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.

Let's proceed to multiply each fraction by the appropriate number in order 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}

Finally we'll combine and obtain the following result:

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

Answer

56 \frac{5}{6}

Exercise #8

Solve the following equation:

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

Video Solution

Step-by-Step Solution

We must first identify the lowest common denominator between 5 and 10.

In order to determine the lowest common denominator, we need to find a number that is divisible by both 5 and 10.

In this case, the common denominator is 10.

We will proceed to 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}

Finally we'll combine and obtain the following:

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

Answer

810 \frac{8}{10}

Exercise #9

Solve the following equation:

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

Video Solution

Step-by-Step Solution

Let's first identify the lowest common denominator between 4 and 2.

In order to identify 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

We will then proceed to multiply each fraction by the appropriate number in order 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}

Finally we will combine and obtain the following:

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

Answer

1 1

Exercise #10

Solve the following exercise:

13+16=? \frac{1}{3}+\frac{1}{6}=\text{?}

Video Solution

Step-by-Step Solution

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

  • Identify the common denominator.
  • Convert each fraction to an equivalent fraction with the common denominator.
  • Add the fractions.
  • Verify the solution against given choices.

Now, let's work through each step:

Step 1: Identify the common denominator. For fractions 13 \frac{1}{3} and 16 \frac{1}{6} , the least common multiple (LCM) of 3 and 6 is 6.

Step 2: Convert 13 \frac{1}{3} to have a denominator of 6. We do this by multiplying both the numerator and denominator by 2:

13=1×23×2=26 \frac{1}{3} = \frac{1 \times 2}{3 \times 2} = \frac{2}{6}

The fraction 16 \frac{1}{6} already has a denominator of 6, so we leave it unchanged:

16=16 \frac{1}{6} = \frac{1}{6}

Step 3: Add the fractions:

26+16=2+16=36 \frac{2}{6} + \frac{1}{6} = \frac{2 + 1}{6} = \frac{3}{6}

The fraction 36 \frac{3}{6} simplifies to 12 \frac{1}{2} , but since the task is to match with given choices, we note that there is no need to simplify further.

After comparing with the given choices, the option that matches our calculation is:

36 \frac{3}{6}

Answer

36 \frac{3}{6}

Exercise #11

Solve the following exercise:

14+18=? \frac{1}{4}+\frac{1}{8}=\text{?}

Video Solution

Step-by-Step Solution

To solve the problem of adding the fractions 14 \frac{1}{4} and 18 \frac{1}{8} , follow these steps:

  • Step 1: Identify the denominators: 4 and 8. We need a common denominator to add the fractions.
  • Step 2: Find the least common multiple (LCM) of 4 and 8. The smallest number that both 4 and 8 can divide is 8, so our common denominator will be 8.
  • Step 3: Convert 14 \frac{1}{4} to a fraction with denominator 8. To do this, multiply both the numerator and the denominator of 14 \frac{1}{4} by 2:
    • 14=1×24×2=28 \frac{1}{4} = \frac{1 \times 2}{4 \times 2} = \frac{2}{8}
  • Step 4: Now add the fractions: 28+18 \frac{2}{8} + \frac{1}{8} .
    • Since the fractions now have the same denominator, add the numerators: 2+1=3 2 + 1 = 3 , while keeping the denominator 8.
    • The result is 38 \frac{3}{8} .
  • Step 5: Ensure the fraction is in its simplest form. The fraction 38 \frac{3}{8} is already simplified, as 3 and 8 have no common factors other than 1.

Therefore, the sum of 14+18 \frac{1}{4} + \frac{1}{8} is 38 \frac{3}{8} .

Once we compare this with the given answer choices, we find that our final result, 38 \frac{3}{8} , matches choice 1.

Hence, the correct answer to the problem is 38 \frac{3}{8} .

Answer

38 \frac{3}{8}

Exercise #12

Solve the following exercise:

16+412=? \frac{1}{6}+\frac{4}{12}=\text{?}

Video Solution

Step-by-Step Solution

To solve the problem of adding 16+412 \frac{1}{6} + \frac{4}{12} , follow these steps:

  • Step 1: Find the least common denominator (LCD) for the fractions. The denominators are 6 and 12, and the LCD is 12.
  • Step 2: Convert 16 \frac{1}{6} to an equivalent fraction with a denominator of 12. To do this, multiply both the numerator and the denominator by 2: 16×22=212 \frac{1}{6} \times \frac{2}{2} = \frac{2}{12} .
  • Step 3: The fraction 412 \frac{4}{12} already has the denominator of 12, so no conversion is needed.
  • Step 4: Add the fractions with the common denominator: 212+412=612 \frac{2}{12} + \frac{4}{12} = \frac{6}{12} .
  • Step 5: Simplify the resulting fraction if possible. In this case, 612 \frac{6}{12} simplifies to 12 \frac{1}{2} , but we will leave it as 612 \frac{6}{12} as it appears in the options.

Therefore, the solution to the problem is 612 \frac{6}{12} , which matches option 3 from the provided answers.

Answer

612 \frac{6}{12}

Exercise #13

Solve the following exercise:

25+510=? \frac{2}{5}+\frac{5}{10}=\text{?}

Video Solution

Step-by-Step Solution

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

  • Step 1: Convert the fractions to have the same denominator.
  • Step 2: Add the fractions.
  • Step 3: Simplify the resulting fraction.

Let's proceed with solving the problem:

Step 1: Convert 25 \frac{2}{5} to a fraction with a denominator of 10. The equivalent fraction is found by multiplying the numerator and the denominator by 2:

25=2×25×2=410 \frac{2}{5} = \frac{2 \times 2}{5 \times 2} = \frac{4}{10}

Step 2: Add the fractions 410 \frac{4}{10} and 510 \frac{5}{10} :

410+510=4+510=910 \frac{4}{10} + \frac{5}{10} = \frac{4 + 5}{10} = \frac{9}{10}

Step 3: Simplify the resulting fraction. Since 910\frac{9}{10} is already in its simplest form, we conclude:

Therefore, the solution to the problem is 910\frac{9}{10}.

Answer

910 \frac{9}{10}

Exercise #14

Solve the following exercise:

14+12=? \frac{1}{4}+\frac{1}{2}=\text{?}

Video Solution

Step-by-Step Solution

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

  • Step 1: Identify the least common denominator (LCD) of the fractions 14 \frac{1}{4} and 12 \frac{1}{2} .
  • Step 2: Convert each fraction to have the common denominator.
  • Step 3: Add the fractions together.

Now, let's work through each step:

Step 1: Identify the Least Common Denominator (LCD).

The denominators are 4 and 2. The smallest number that both 4 and 2 can divide into without a remainder is 4. Thus, the LCD is 4.

Step 2: Convert each fraction to have the common denominator.

The fraction 14\frac{1}{4} already has the denominator 4, so it remains the same: 14\frac{1}{4}.

The fraction 12\frac{1}{2} needs to be converted. We multiply both the numerator and denominator by 2 to get the equivalent fraction 24\frac{2}{4}.

Step 3: Add the fractions.

The fractions 14\frac{1}{4} and 24\frac{2}{4} share a common denominator, so we can add the numerators:

14+24=1+24=34\frac{1}{4} + \frac{2}{4} = \frac{1 + 2}{4} = \frac{3}{4}.

Therefore, the solution to the problem is 34\frac{3}{4}.

Answer

34 \frac{3}{4}

Exercise #15

Solve the following equation:

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

Video Solution

Step-by-Step Solution

We must first identify the lowest common denominator between 3 and 9.

In order to determine 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.

We will then proceed to 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}

Finally we'll combine and obtain the following:

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

Answer

79 \frac{7}{9}

Exercise #16

Solve the following exercise:

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

Solve the following equation:

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

Video Solution

Step-by-Step Solution

We must first identify the lowest common denominator between 3 and 9.

In order to determine 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.

We will then proceed to 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}

Finally we'll combine and obtain the following:

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

Answer

59 \frac{5}{9}

Exercise #18

Solve the following exercise:

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 #19

Solve the following equation:

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

Video Solution

Step-by-Step Solution

We must first identify the lowest common denominator between 4 and 12.

In order to determine the lowest common denominator, we need to find a number that is divisible by both 4 and 12.

In this case, the common denominator is 12.

We will then 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 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}

Finally we'll combine and obtain the following:

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

Answer

912 \frac{9}{12}

Exercise #20

Solve the following exercise:

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}