Solve the Fraction Division: 1/4 ÷ □ = 1/2

Fraction Division with Missing Divisors

Fill in the missing part:

14: —=12 \frac{1}{4}:_{\text{ —}}=\frac{1}{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 unknown
00:11 Any number divided by itself always equals 1
00:15 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:

14: —=12 \frac{1}{4}:_{\text{ —}}=\frac{1}{2}

What is the missing number?

2

Step-by-step solution

To solve this problem, we need to determine the number that, when 14\frac{1}{4} is divided by it, results in 12\frac{1}{2}. This can be set up as:

14÷x=12 \frac{1}{4} \div x = \frac{1}{2}

To solve for x x , recall that dividing by a number is the same as multiplying by its reciprocal. Thus, we can rewrite the equation:

14×1x=12 \frac{1}{4} \times \frac{1}{x} = \frac{1}{2}

Now, we can set the numerators equal to each other, recognizing that the denominators are 11 when multiplied:

14x=12 \frac{1}{4x} = \frac{1}{2}

To solve for xx, we equate this expression by removing fractions through cross multiplication:

1×2=1×4x 1 \times 2 = 1 \times 4x

2=4x 2 = 4x

Divide both sides by 4 to isolate xx:

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

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

3

Final Answer

12 \frac{1}{2}

Key Points to Remember

Essential concepts to master this topic
  • Division Rule: To find missing divisor, use 14÷x=12 \frac{1}{4} \div x = \frac{1}{2}
  • Cross-Multiplication: From 14x=12 \frac{1}{4x} = \frac{1}{2} , get 2 = 4x
  • Verification: Check 14÷12=14×2=12 \frac{1}{4} \div \frac{1}{2} = \frac{1}{4} \times 2 = \frac{1}{2}

Common Mistakes

Avoid these frequent errors
  • Multiplying instead of dividing to solve
    Don't multiply 14×12=18 \frac{1}{4} \times \frac{1}{2} = \frac{1}{8} ! This gives the wrong operation entirely. The problem asks what divided by gives the result. Always set up the division equation 14÷x=12 \frac{1}{4} \div x = \frac{1}{2} first.

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 rewrite division as multiplication by reciprocal?

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Division by a number is the same as multiplying by its reciprocal. So 14÷x \frac{1}{4} \div x becomes 14×1x=14x \frac{1}{4} \times \frac{1}{x} = \frac{1}{4x} , which is easier to solve!

How do I know if I should get a fraction or whole number?

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The answer depends on the numbers in the problem. Since we're dividing 14 \frac{1}{4} by something to get 12 \frac{1}{2} (which is larger), the divisor must be a fraction less than 1.

Can I use a different method to solve this?

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Yes! You can think: "What times 12 \frac{1}{2} equals 14 \frac{1}{4} ?" This gives x×12=14 x \times \frac{1}{2} = \frac{1}{4} , so x=14×2=12 x = \frac{1}{4} \times 2 = \frac{1}{2} .

Why is the answer smaller than what we started with?

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When you divide by a fraction less than 1, the result gets larger! Since 12>14 \frac{1}{2} > \frac{1}{4} , we needed to divide by 12 \frac{1}{2} (which is less than 1) to make the result bigger.

How do I check my answer?

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Substitute back: 14÷12=14×21=24=12 \frac{1}{4} \div \frac{1}{2} = \frac{1}{4} \times \frac{2}{1} = \frac{2}{4} = \frac{1}{2} ✓ The result matches what we wanted!

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