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

Exercise #1

Complete the missing fraction
38——=18 \frac{3}{8}-_{——}=\frac{1}{8}

What is the missing fraction?

Video Solution

Step-by-Step Solution

Let's solve the problem using the steps outlined in our analysis:

Start with the equation given in the problem:

38x=18 \frac{3}{8} - x = \frac{1}{8}

Step 1: Add xx to both sides to isolate it:

38=18+x \frac{3}{8} = \frac{1}{8} + x

Step 2: Subtract 18\frac{1}{8} from both sides to solve for xx:

3818=x \frac{3}{8} - \frac{1}{8} = x

Step 3: Simplify the left side of the equation:

  • Subtract the numerators: 31=23 - 1 = 2
  • Maintain the common denominator: 8

So we have:

28=x \frac{2}{8} = x

Therefore, the missing fraction is 28\frac{2}{8}.

Matching our solution to the answer choices, the correct choice is:

Choice 3: 28\frac{2}{8}

Therefore, the solution to the problem is 28\frac{2}{8}.

Answer

28 \frac{2}{8}

Exercise #2

29+?=23 \frac{2}{9}+?=\frac{2}{3}

Video Solution

Step-by-Step Solution

To find the missing fraction in the equation 29+?=23 \frac{2}{9} + ? = \frac{2}{3} , we will perform the following steps:

  • Step 1: Convert the fraction 23 \frac{2}{3} to have the same denominator as 29 \frac{2}{9} .
  • Step 2: Subtract 29 \frac{2}{9} from the new fraction.

Let's execute these steps:
Step 1: Convert 23\frac{2}{3} into a fraction with a denominator of 9. To do this, multiply both the numerator and the denominator of 23\frac{2}{3} by 3 to obtain an equivalent fraction:
23×33=69\frac{2}{3} \times \frac{3}{3} = \frac{6}{9}

Step 2: Subtract 29\frac{2}{9} from 69\frac{6}{9}:
6929=49\frac{6}{9} - \frac{2}{9} = \frac{4}{9}

Thus, the fraction that we need to add to 29\frac{2}{9} to get 23\frac{2}{3} is 49\frac{4}{9}.

The correct answer to the problem is 49\frac{4}{9}.

Answer

49 \frac{4}{9}

Exercise #3

56×?=13 \frac{5}{6}\times?=\frac{1}{3}

Video Solution

Step-by-Step Solution

To solve the equation 56×?=13 \frac{5}{6} \times ? = \frac{1}{3} , we need to find the missing number represented by "?".

We can solve this problem by using the following steps:

  • Step 1: Identify the equation we are working with:
    We have the equation 56×?=13 \frac{5}{6} \times ? = \frac{1}{3} .
  • Step 2: Isolate the unknown variable, "?":
    To do this, divide both sides of the equation by 56 \frac{5}{6} .
  • Perform the division:
    ?=1356=13×65? = \frac{\frac{1}{3}}{\frac{5}{6}} = \frac{1}{3} \times \frac{6}{5}
  • Step 3: Simplify the expression:
    Now, multiply 13 \frac{1}{3} by the reciprocal of 56 \frac{5}{6} :
    ?=1×63×5=615? = \frac{1 \times 6}{3 \times 5} = \frac{6}{15}
  • Simplify the fraction 615\frac{6}{15}:
    The greatest common divisor of 6 and 15 is 3, so divide both the numerator and the denominator by 3:
    ?=6÷315÷3=25? = \frac{6 \div 3}{15 \div 3} = \frac{2}{5}

Therefore, the solution to the problem is 25 \frac{2}{5} .

Answer

25 \frac{2}{5}

Exercise #4

24×?=27 \frac{2}{4}\times?=\frac{2}{7}

Video Solution

Step-by-Step Solution

To solve the problem, let's use the equation provided:

24×x=27\frac{2}{4} \times x = \frac{2}{7}

Step 1: Isolate the missing fraction xx by dividing both sides by 24\frac{2}{4}.

x=2724x = \frac{\frac{2}{7}}{\frac{2}{4}}

Step 2: Simplify the division of the fractions. Recall that dividing by a fraction is the same as multiplying by its reciprocal.

x=27×42x = \frac{2}{7} \times \frac{4}{2}

Step 3: Simplify the multiplication by canceling common factors. Here, 42\frac{4}{2} simplifies to 2.

x=2×47×2=47x = \frac{2 \times 4}{7 \times 2} = \frac{4}{7}

Therefore, the missing fraction xx is 47\frac{4}{7}.

Thus, the correct answer is:

47 \frac{4}{7} (corresponds to choice 3)

Answer

47 \frac{4}{7}

Exercise #5

Complete the missing fraction
25——=15 \frac{2}{5}-_{——}=\frac{1}{5}

What is the missing fraction?

Video Solution

Step-by-Step Solution

To solve the problem 25_=15 \frac{2}{5} - \_ = \frac{1}{5} , we will use the concept of subtraction of fractions to find the missing fraction.

Let's follow these steps:

  • Step 1: Identify the given fractions.
  • Step 2: Use the subtraction identity to find the missing fraction.
  • Step 3: Solve for the missing fraction.

Step 1: The initial fraction (minuend) is 25 \frac{2}{5} and the result (difference) is 15 \frac{1}{5} .

Step 2: Apply the formula from our analysis: MinuendDifference=Subtrahend \text{Minuend} - \text{Difference} = \text{Subtrahend} . That means 2515=_ \frac{2}{5} - \frac{1}{5} = \_ .

Step 3: Perform the subtraction by subtracting the numerators:

2515=215=15 \frac{2}{5} - \frac{1}{5} = \frac{2 - 1}{5} = \frac{1}{5} .

Therefore, the missing fraction is 15 \frac{1}{5} .

Answer

15 \frac{1}{5}

Exercise #6

110+?=34 \frac{1}{10}+?=\frac{3}{4}

Video Solution

Step-by-Step Solution

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

  • Convert the fractions to have a common denominator.
  • Subtract to find the missing value.
  • Simplify the resulting fraction.

Step 1: Start with the equation 110+?=34 \frac{1}{10} + ? = \frac{3}{4} .
Step 2: Rewrite it to find the missing term: ?=34110 ? = \frac{3}{4} - \frac{1}{10} .

Step 3: To subtract, find a common denominator. The least common multiple of 4 and 10 is 20:

  • Convert 34 \frac{3}{4} to have a denominator of 20: 34=1520 \frac{3}{4} = \frac{15}{20} .
  • Convert 110 \frac{1}{10} to have a denominator of 20: 110=220 \frac{1}{10} = \frac{2}{20} .

Step 4: Subtract 220 \frac{2}{20} from 1520 \frac{15}{20} :
1520220=1320 \frac{15}{20} - \frac{2}{20} = \frac{13}{20} .

Step 5: Verify with the provided choices. The correct answer choice is the fraction 1320 \frac{13}{20} , which matches choice 4.

Therefore, the solution to the problem is 1320 \frac{13}{20} .

Answer

1320 \frac{13}{20}

Exercise #7

?+34=45 ?+\frac{3}{4}=\frac{4}{5}

Video Solution

Step-by-Step Solution

To solve this problem, we aim to find x x in the equation x+34=45 x + \frac{3}{4} = \frac{4}{5} .

Step 1: Isolate x x by subtracting 34\frac{3}{4} from both sides.

x=4534 x = \frac{4}{5} - \frac{3}{4}

Step 2: Find a common denominator for the fractions 45\frac{4}{5} and 34\frac{3}{4}. The least common denominator of 5 and 4 is 20.

Convert 45\frac{4}{5} to a fraction with a denominator of 20:

45=4×45×4=1620 \frac{4}{5} = \frac{4 \times 4}{5 \times 4} = \frac{16}{20}

Convert 34\frac{3}{4} to a fraction with a denominator of 20:

34=3×54×5=1520 \frac{3}{4} = \frac{3 \times 5}{4 \times 5} = \frac{15}{20}

Step 3: Subtract the two fractions:

x=16201520=161520=120 x = \frac{16}{20} - \frac{15}{20} = \frac{16 - 15}{20} = \frac{1}{20}

Therefore, the missing fraction x x is 120\frac{1}{20}.

Answer

120 \frac{1}{20}

Exercise #8

Complete the missing fraction
34——=24 \frac{3}{4}-_{——}=\frac{2}{4}

What is the missing fraction?

Video Solution

Step-by-Step Solution

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

  • Identify the fractions involved in the given equation.
  • Subtract the result fraction from the starting fraction to find the missing fraction.

Now, let's work through each step:

Step 1: Identify the fractions.
The given equation is 34(missing fraction)=24 \frac{3}{4} - \text{(missing fraction)} = \frac{2}{4} .

Step 2: Subtract the result fraction from the starting fraction.
We rearrange the equation to find the missing fraction: 3424=missing fraction \frac{3}{4} - \frac{2}{4} = \text{missing fraction} .

Step 3: Perform the subtraction.
Since the denominators are the same (4), we subtract the numerators: 32=1 3 - 2 = 1 .

Step 4: Write the result over the common denominator.
The missing fraction is 14 \frac{1}{4} .

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

Answer

14 \frac{1}{4}

Exercise #9

Complete the missing fraction
23——=13 \frac{2}{3}-_{——}=\frac{1}{3}

What is the missing fraction?

Video Solution

Step-by-Step Solution

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

  • Identify the fractions involved: 23 \frac{2}{3} and 13 \frac{1}{3} .
  • Recognize that the denominators are the same, which simplifies subtraction.
  • Subtract the fraction 13 \frac{1}{3} from 23 \frac{2}{3} to determine the missing fraction.

Let’s calculate the missing fraction:

Given the equation:

23missing fraction=13 \frac{2}{3} - \text{missing fraction} = \frac{1}{3}

Rearrange to solve for the missing fraction:

missing fraction=2313\text{missing fraction} = \frac{2}{3} - \frac{1}{3}

Because the fractions have a common denominator, subtract the numerators:

2313=213=13\frac{2}{3} - \frac{1}{3} = \frac{2-1}{3} = \frac{1}{3}

The missing fraction is thus 13\frac{1}{3}.

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

Answer

13 \frac{1}{3}

Exercise #10

14×?=15 \frac{1}{4}\times?=\frac{1}{5}

Video Solution

Step-by-Step Solution

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

  • Step 1: Identify the known values and the variable to solve for.
  • Step 2: Rearrange the equation to isolate the unknown variable.
  • Step 3: Perform the arithmetic calculation to find the solution.

Now, let's work through each step:

Step 1: We have the equation 14×?=15 \frac{1}{4} \times ? = \frac{1}{5} . Our task is to find the value of the question mark (?).

Step 2: To isolate the question mark, we divide both sides of the equation by 14 \frac{1}{4} . This is equivalent to multiplying both sides by the reciprocal of 14 \frac{1}{4} , which is 4 4 . Thus, we have:

?=15×4 ? = \frac{1}{5} \times 4

Step 3: Perform the multiplication:

?=1×45×1=45 ? = \frac{1 \times 4}{5 \times 1} = \frac{4}{5}

Therefore, the number that satisfies the equation is 45 \frac{4}{5} .

The correct answer is choice 1: 45 \frac{4}{5} .

Answer

45 \frac{4}{5}

Exercise #11

16+?=12 \frac{1}{6}+?=\frac{1}{2}

Video Solution

Step-by-Step Solution

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

  • Step 1: Rearrange the equation 16+x=12\frac{1}{6} + x = \frac{1}{2} to solve for xx.
  • Step 2: Subtract 16\frac{1}{6} from both sides of the equation, so x=1216x = \frac{1}{2} - \frac{1}{6}.
  • Step 3: Using a common denominator for subtraction.

Now, let's work through each step:
Step 1: Rearrange the equation: x=1216x = \frac{1}{2} - \frac{1}{6}.
Step 2: To subtract fractions, we need a common denominator. The least common denominator of 2 and 6 is 6.
Step 3: Rewrite each fraction with the common denominator:
12=36 \frac{1}{2} = \frac{3}{6} And 16\frac{1}{6} is already with the denominator 6.
Step 4: Subtract the fractions: x=3616=26x = \frac{3}{6} - \frac{1}{6} = \frac{2}{6}.
Step 5: Simplify 26\frac{2}{6} to 13\frac{1}{3}.

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

Answer

13 \frac{1}{3}

Exercise #12

Complete the missing fraction:
45——=35 \frac{4}{5}-_{——}=\frac{3}{5}

What is the missing fraction?

Video Solution

Step-by-Step Solution

To solve this problem, we need to determine the missing fraction in the equation 45_=35 \frac{4}{5} - \_ = \frac{3}{5} .

Since both fractions have the same denominator, we can focus solely on subtracting the numerators, as the denominators remain unchanged.

The numerators are 44 and 33. To find the missing fraction, calculate the difference between the numerators:

  • Step 1: Subtract the numerators: 43=14 - 3 = 1.
  • Step 2: The common denominator remains 55.
  • Step 3: Thus, the missing fraction is 15\frac{1}{5}.

Therefore, the missing fraction in the equation is 15\frac{1}{5}.

Comparing with the options provided, the correct choice is option 2: 15\frac{1}{5}.

Therefore, the solution to the problem is 15\frac{1}{5}.

Answer

15 \frac{1}{5}

Exercise #13

35×?=24 \frac{3}{5}\times?=\frac{2}{4}

Video Solution

Step-by-Step Solution

To solve this problem, we need to find the missing fraction x x such that 35×x=24 \frac{3}{5} \times x = \frac{2}{4} . We'll follow these steps:

  • Step 1: Simplify the fraction 24 \frac{2}{4} to 12 \frac{1}{2} .
  • Step 2: Set up the equation to solve for x x . This gives us 35×x=12 \frac{3}{5} \times x = \frac{1}{2} .
  • Step 3: Isolate x x by dividing both sides by 35 \frac{3}{5} , leading to x=1235 x = \frac{\frac{1}{2}}{\frac{3}{5}} .
  • Step 4: Simplify the complex fraction by multiplying by the reciprocal: x=12×53 x = \frac{1}{2} \times \frac{5}{3} .
  • Step 5: Calculate the multiplication: x=1×52×3=56 x = \frac{1 \times 5}{2 \times 3} = \frac{5}{6} .

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

Answer

56 \frac{5}{6}

Exercise #14

714+?=12 \frac{7}{14}+?=\frac{1}{2}

Video Solution

Step-by-Step Solution

To solve this problem, we will focus on simplifying the fraction on the left side and comparing it to the fraction on the right side:

  • Step 1: Simplify the fraction 714 \frac{7}{14} . Since both 7 and 14 have a common factor of 7, we can divide both the numerator and denominator by 7 to get 12 \frac{1}{2} .
  • Step 2: We now have the equation 12+?=12 \frac{1}{2} + ? = \frac{1}{2} .
  • Step 3: To determine what needs to be added to 12 \frac{1}{2} to result in 12 \frac{1}{2} , we can see that nothing needs to be added. Therefore, the unknown term ? ? should be 0.

This makes sense because adding zero to any number does not change its value.

Therefore, the solution to the problem is 0 0 .

Answer

0 0