Solve: 2 × 2⅓ Multiplication with Mixed Numbers

Fraction Multiplication with Mixed Numbers

2×213= 2\times2\frac{1}{3}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 First convert the mixed number to fraction
00:17 Multiply the numerator by the denominator
00:24 Calculate the multiplication
00:28 Now convert to mixed number
00:32 Break down 14 into 12 plus 2
00:40 Break down the fraction into whole number and remainder
00:48 Convert whole fraction to whole number, and combine with mixed number
00:58 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

2×213= 2\times2\frac{1}{3}=

2

Step-by-step solution

To solve the problem, let's proceed with the following steps:

  • Step 1: Convert the mixed number 2132 \frac{1}{3} to an improper fraction.
  • Step 2: Perform the multiplication with the whole number 2.
  • Step 3: Simplify and, if required, convert the result back to a mixed number.

Now, let's work through each step:

Step 1: Convert 2132 \frac{1}{3} to an Improper Fraction

The mixed number 2132 \frac{1}{3} can be converted to an improper fraction by multiplying the whole number 2 by the denominator 3 and adding the numerator 1. Thus, 213=2×3+13=6+13=732 \frac{1}{3} = \frac{2 \times 3 + 1}{3} = \frac{6 + 1}{3} = \frac{7}{3}.

Step 2: Multiply by 2

Next, multiply the improper fraction 73\frac{7}{3} by the whole number 2. Treat 2 as 21\frac{2}{1} for multiplication: 73×21=7×23×1=143\frac{7}{3} \times \frac{2}{1} = \frac{7 \times 2}{3 \times 1} = \frac{14}{3}.

Step 3: Simplify or Convert the Improper Fraction

Finally, convert the improper fraction 143\frac{14}{3} back to a mixed number, if desired:

  • Divide the numerator by the denominator: 14÷3=414 \div 3 = 4 with a remainder of 2.
  • This results in the mixed number 4234\frac{2}{3}.

Therefore, the solution to the problem is 4234\frac{2}{3}.

3

Final Answer

423 4\frac{2}{3}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions before multiplying
  • Technique: 213=73 2\frac{1}{3} = \frac{7}{3} , then multiply: 2×73=143 2 \times \frac{7}{3} = \frac{14}{3}
  • Check: Convert answer back to mixed number: 143=423 \frac{14}{3} = 4\frac{2}{3}

Common Mistakes

Avoid these frequent errors
  • Multiplying just the whole number part
    Don't multiply 2 × 2 = 4 and ignore the fraction! This gives 4 instead of 423 4\frac{2}{3} . You're missing the fractional part entirely. Always convert the mixed number to an improper fraction first, then multiply the entire fraction.

Practice Quiz

Test your knowledge with interactive questions

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

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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Because 213 2\frac{1}{3} means 2 + 13 \frac{1}{3} , not separate parts! When you multiply by 2, you need to multiply the entire mixed number, which includes both the whole and fractional parts together.

How do I convert a mixed number to an improper fraction?

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Formula: Multiply whole number by denominator, then add numerator. For 213 2\frac{1}{3} : (2×3)+1=7 (2 \times 3) + 1 = 7 , so it becomes 73 \frac{7}{3} .

Do I always need to convert back to a mixed number?

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It depends on the question format! If the answer choices show mixed numbers like 423 4\frac{2}{3} , then yes. If they show improper fractions, you can leave it as 143 \frac{14}{3} .

What if I get confused with the arithmetic?

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Break it down step by step: Step 1: Convert mixed to improper. Step 2: Write whole number as fraction (2=21 2 = \frac{2}{1} ). Step 3: Multiply numerators and denominators separately.

How do I check if my answer is right?

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Use estimation! 2×213 2 \times 2\frac{1}{3} should be slightly less than 2×2.5=5 2 \times 2.5 = 5 . Since 423 4\frac{2}{3} is about 4.67, this makes sense!

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