Solve Mixed Number Multiplication: 3⅓ × 2⅕ Step-by-Step

Mixed Number Multiplication with Simplification Steps

3515×2210= 3\frac{5}{15}\times2\frac{2}{10}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Reduce what we can
00:35 Convert mixed fractions to fractions
00:45 Calculate the numerators
00:51 Make sure to multiply numerator by numerator and denominator by denominator
00:58 Calculate the products
01:06 Now convert to mixed fraction
01:10 Break down 110 into 105 plus 5
01:17 Break down the fraction into whole number and remainder
01:23 Reduce what we can
01:29 Convert proper fraction to whole number and add to mixed number
01:32 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

3515×2210= 3\frac{5}{15}\times2\frac{2}{10}=

2

Step-by-step solution

To solve this problem, follow these steps:

  • Step 1: Convert mixed numbers to improper fractions.
  • Step 2: Simplify the fractions if feasible.
  • Step 3: Multiply the improper fractions.
  • Step 4: Convert the result back to a mixed number.

Let's work through the steps:

Step 1: Convert the mixed numbers to improper fractions.

3515=3+515=4515+515=50153\frac{5}{15} = 3 + \frac{5}{15} = \frac{45}{15} + \frac{5}{15} = \frac{50}{15}, simplifying yields 103\frac{10}{3}.

2210=2+210=2010+210=22102\frac{2}{10} = 2 + \frac{2}{10} = \frac{20}{10} + \frac{2}{10} = \frac{22}{10}, simplifying yields 115\frac{11}{5}.

Step 2: Multiply the fractions.

103×115=11015\frac{10}{3} \times \frac{11}{5} = \frac{110}{15}.

Step 3: Simplify the result of the multiplication.

11015\frac{110}{15} can be simplified by dividing the numerator and the denominator by 5, yielding 223\frac{22}{3}.

Step 4: Convert the resulting improper fraction back to a mixed number.

Dividing, 22÷3=722 \div 3 = 7 with a remainder of 1, so 223=713\frac{22}{3} = 7\frac{1}{3}.

Therefore, the solution to the problem is 7137\frac{1}{3}.

3

Final Answer

713 7\frac{1}{3}

Key Points to Remember

Essential concepts to master this topic
  • Convert: Change mixed numbers to improper fractions first
  • Simplify: Reduce fractions before multiplying: 5015=103 \frac{50}{15} = \frac{10}{3}
  • Check: Convert final answer back to mixed number and verify 713 7\frac{1}{3}

Common Mistakes

Avoid these frequent errors
  • Multiplying whole numbers and fractions separately
    Don't multiply 3 × 2 = 6 and then try to add fraction parts separately = wrong answer like 6²⁄₃! This ignores how mixed numbers actually work. Always convert to improper fractions first, then multiply across.

Practice Quiz

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\( 5:\frac{2}{5}= \)

FAQ

Everything you need to know about this question

Why can't I just multiply the whole numbers and fractions separately?

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Mixed numbers represent one complete value, not separate parts! When you multiply 313×215 3\frac{1}{3} \times 2\frac{1}{5} , you're multiplying the entire amounts, not just pieces.

Do I always need to simplify fractions before multiplying?

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It's highly recommended! Simplifying 515 \frac{5}{15} to 13 \frac{1}{3} first makes calculations much easier and reduces errors with large numbers.

How do I convert mixed numbers to improper fractions quickly?

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Use this formula: (whole number × denominator) + numerator, then put over the original denominator. For 3515 3\frac{5}{15} : (3 × 15) + 5 = 50, so 5015 \frac{50}{15}

What if my final fraction is improper?

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Always convert improper fractions back to mixed numbers! Divide the numerator by denominator: 223 \frac{22}{3} becomes 713 7\frac{1}{3} since 22 ÷ 3 = 7 remainder 1.

Can I use cross multiplication for this problem?

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No! Cross multiplication only works for proportions (equations with one fraction equals another). For multiplying mixed numbers, you must convert to improper fractions and multiply straight across.

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