Solve Mixed Number Division: 1½ ÷ ⅔ Step-by-Step

Mixed Number Division with Improper Fractions

112:23= 1\frac{1}{2}:\frac{2}{3}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Convert mixed number to fraction
00:09 Calculate the numerator and substitute back into the exercise
00:17 Convert division to multiplication by reciprocal
00:30 Make sure to multiply numerator by numerator and denominator by denominator
00:37 Calculate the multiplications
00:42 Now convert to mixed number
00:46 Break down 9 into 8 plus 1
00:52 Break down the fraction into whole number and remainder
00:56 Convert whole fraction to whole number, and combine with mixed number
01:05 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

112:23= 1\frac{1}{2}:\frac{2}{3}=

2

Step-by-step solution

To solve the given problem, we need to divide the mixed number by the fraction 23\frac{2}{3}. Here's a detailed step-by-step solution:

Step 1: Convert Mixed Number to Improper Fraction.
The mixed number 1121\frac{1}{2} can be converted into an improper fraction. Multiply the whole number 1 by the denominator 2, and add the numerator 1. This gives us:

1×2+1=2+1=3 1 \times 2 + 1 = 2 + 1 = 3 Thus, the improper fraction is 32\frac{3}{2}.

Step 2: Divide by the Fraction 23\frac{2}{3}.
Dividing by a fraction is equivalent to multiplying by its reciprocal. So, 32÷23\frac{3}{2} \div \frac{2}{3} becomes 32×32\frac{3}{2} \times \frac{3}{2}.

Step 3: Perform the Multiplication.
Multiply the numerators together and the denominators together:

32×32=3×32×2=94 \frac{3}{2} \times \frac{3}{2} = \frac{3 \times 3}{2 \times 2} = \frac{9}{4}

Step 4: Convert to a Mixed Number if Needed.
Convert 94\frac{9}{4} back to a mixed number. Divide 9 by 4, which gives 2 with a remainder of 1:

9÷4=2(whole number),remainder 1 9 \div 4 = 2 \quad \text{(whole number)}, \quad \text{remainder } 1 Thus, 94=214\frac{9}{4} = 2\frac{1}{4}.

Therefore, the solution to the problem is 214\boxed{2\frac{1}{4}}.

3

Final Answer

214 2\frac{1}{4}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions before dividing
  • Technique: Multiply by reciprocal: 32×32=94 \frac{3}{2} \times \frac{3}{2} = \frac{9}{4}
  • Check: Convert answer back to mixed number: 94=214 \frac{9}{4} = 2\frac{1}{4}

Common Mistakes

Avoid these frequent errors
  • Using wrong reciprocal when dividing by fraction
    Don't flip 23 \frac{2}{3} to 23 \frac{2}{3} instead of 32 \frac{3}{2} = wrong multiplication! This gives 32×23=1 \frac{3}{2} \times \frac{2}{3} = 1 instead of the correct answer. Always flip the divisor fraction completely: numerator becomes denominator and denominator becomes numerator.

Practice Quiz

Test your knowledge with interactive questions

\( \frac{1}{2}:3= \)\( \)\( \)\( \)

FAQ

Everything you need to know about this question

Why do I need to convert the mixed number first?

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Mixed numbers can't be divided directly! You need to convert 112 1\frac{1}{2} to 32 \frac{3}{2} first. This makes the division much easier and prevents calculation errors.

How do I remember which fraction to flip?

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Always flip the second fraction (the one you're dividing by). In 32÷23 \frac{3}{2} \div \frac{2}{3} , flip 23 \frac{2}{3} to get 32 \frac{3}{2} , then multiply!

Can I leave my answer as an improper fraction?

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It depends on what the problem asks for! If you see mixed number answer choices like 214 2\frac{1}{4} , convert your improper fraction. Otherwise, both 94 \frac{9}{4} and 214 2\frac{1}{4} are correct.

What if I get confused with the reciprocal?

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Remember: "flip and multiply"! The reciprocal of 23 \frac{2}{3} is 32 \frac{3}{2} . Just swap the top and bottom numbers, then multiply instead of dividing.

How do I convert back to a mixed number?

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Divide the numerator by the denominator: 9÷4=2 9 \div 4 = 2 remainder 1 1 . The whole number is 2, and the remainder 1 goes over the original denominator: 214 2\frac{1}{4} .

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