Solve 3 × 1/2: Multiplying a Whole Number by a Fraction

Fraction Multiplication with Whole Number Conversion

3×12= 3\times\frac{1}{2}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:04 Let's solve the problem together.
00:08 First, change the multiplication into the numerator form.
00:12 Now, calculate the multiplication step.
00:16 Next, convert it into a mixed fraction.
00:19 We'll break down the number three into two, plus one.
00:23 Decompose the fraction into a whole number and a remainder.
00:28 Now, change the improper fraction to a whole number, and put it in mixed fraction form.
00:35 And there you have it! That's the solution to the question.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

3×12= 3\times\frac{1}{2}=

2

Step-by-step solution

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

  • Multiply the numerator of the fraction by the integer.
  • Keep the denominator unchanged.
  • Convert the resulting improper fraction to a mixed number, if necessary.

Now, let's work through each step:
Step 1: Multiply the numerator of 12 \frac{1}{2} , which is 1 1 , by 3 3 :
1×3=3 1 \times 3 = 3 .

Step 2: Write the result over the original denominator:
32 \frac{3}{2} .

Step 3: Convert the improper fraction 32 \frac{3}{2} to a mixed number:
Divide 3 3 by 2 2 . This gives 1 1 as the quotient and 1 1 as the remainder, so:
32=112 \frac{3}{2} = 1\frac{1}{2} .

Therefore, the solution to the problem is 112 1\frac{1}{2} .

3

Final Answer

112 1\frac{1}{2}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Multiply whole number by numerator, keep denominator unchanged
  • Technique: Convert 3×12=32 3 \times \frac{1}{2} = \frac{3}{2} then to mixed number
  • Check: Verify 112=32 1\frac{1}{2} = \frac{3}{2} equals original calculation ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying both numerator and denominator by the whole number
    Don't multiply both 1 and 2 by 3 to get 36 \frac{3}{6} = wrong answer! This changes the fraction's value completely. Always multiply only the numerator by the whole number and keep the denominator the same.

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

Why don't I multiply the denominator by 3 too?

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The denominator tells us the size of each piece. When you have 3 groups of 12 \frac{1}{2} , you still have halves - just more of them! Only multiply the numerator to count how many pieces you have total.

How do I convert 32 \frac{3}{2} to a mixed number?

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Divide the numerator by the denominator: 3 ÷ 2 = 1 remainder 1. The quotient becomes the whole number, and the remainder goes over the original denominator: 112 1\frac{1}{2} .

Can I leave my answer as an improper fraction?

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Yes! 32 \frac{3}{2} is mathematically correct. However, mixed numbers like 112 1\frac{1}{2} are often preferred because they're easier to visualize and understand.

What if the whole number is larger, like 5 × 12 \frac{1}{2} ?

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Same process! Multiply: 5×1=5 5 \times 1 = 5 , so you get 52 \frac{5}{2} . Then convert: 5 ÷ 2 = 2 remainder 1, giving you 212 2\frac{1}{2} .

How can I visualize this problem?

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Think of it as 3 groups of half! If you have 3 cookies and each is cut in half, you get 3 halves total. That's 32 \frac{3}{2} or 112 1\frac{1}{2} whole cookies.

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