Solve: Finding the Missing Divisor in 3/4 ÷ ? = 3/2

Fraction Division with Missing Divisor

Fill in the missing part:

34: —=32 \frac{3}{4}:_{\text{ —}}=\frac{3}{2}

What is the missing number?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find the missing number
00:09 Any number divided by 1 equals itself
00:14 4 divided by 2 equals 2
00:18 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Fill in the missing part:

34: —=32 \frac{3}{4}:_{\text{ —}}=\frac{3}{2}

What is the missing number?

2

Step-by-step solution

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

  • Express the division as a multiplication problem.
  • Rearrange the equation to isolate the missing fraction.
  • Perform the necessary algebraic manipulations to solve for the missing fraction.

Now, let's work through each step:

Step 1: Express the division as multiplication. The equation 34:ab=32 \frac{3}{4} : \frac{a}{b} = \frac{3}{2} converts to 34=32×ab \frac{3}{4} = \frac{3}{2} \times \frac{a}{b} .

Step 2: Rearrange the equation to isolate the missing fraction. Divide both sides by 32 \frac{3}{2} to find ab \frac{a}{b} .

To divide by a fraction, multiply by its reciprocal:

34÷32=34×23=3×24×3=612=12 \frac{3}{4} \div \frac{3}{2} = \frac{3}{4} \times \frac{2}{3} = \frac{3 \times 2}{4 \times 3} = \frac{6}{12} = \frac{1}{2} .

Therefore, the missing fraction is 12 \frac{1}{2} .

3

Final Answer

12 \frac{1}{2}

Key Points to Remember

Essential concepts to master this topic
  • Rule: To find missing divisor, rearrange division equation using multiplication
  • Technique: Convert 34÷x=32 \frac{3}{4} ÷ x = \frac{3}{2} to x=34÷32 x = \frac{3}{4} ÷ \frac{3}{2}
  • Check: Verify 34÷12=34×2=32 \frac{3}{4} ÷ \frac{1}{2} = \frac{3}{4} × 2 = \frac{3}{2}

Common Mistakes

Avoid these frequent errors
  • Multiplying the dividend and quotient instead of dividing
    Don't multiply 34×32=98 \frac{3}{4} × \frac{3}{2} = \frac{9}{8} ! This gives a completely wrong divisor that doesn't work in the original equation. Always remember: if a ÷ b = c, then b = a ÷ c.

Practice Quiz

Test your knowledge with interactive questions

\( \frac{1}{3}+\frac{1}{4}= \)

FAQ

Everything you need to know about this question

Why do I multiply by the reciprocal when dividing fractions?

+

Dividing by a fraction is the same as multiplying by its reciprocal. So 34÷32 \frac{3}{4} ÷ \frac{3}{2} becomes 34×23 \frac{3}{4} × \frac{2}{3} , which is much easier to calculate!

How do I know which number is missing in the division?

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Look at the position! In 34÷?=32 \frac{3}{4} ÷ ? = \frac{3}{2} , the divisor (the number you're dividing by) is missing. The dividend 34 \frac{3}{4} and quotient 32 \frac{3}{2} are given.

Can I use a different method to solve this?

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Yes! You can think of it as 34=32×? \frac{3}{4} = \frac{3}{2} × ? and solve by dividing both sides by 32 \frac{3}{2} . Both methods give the same answer!

What if my answer doesn't look like the choices given?

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Always simplify your fraction to lowest terms! 612 \frac{6}{12} simplifies to 12 \frac{1}{2} by dividing both numerator and denominator by 6.

How can I check if my answer is correct?

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Substitute your answer back into the original equation: 34÷12 \frac{3}{4} ÷ \frac{1}{2} should equal 32 \frac{3}{2} . Since 34×2=64=32 \frac{3}{4} × 2 = \frac{6}{4} = \frac{3}{2} , it works!

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