Calculate the Product: 2¼ × 1⅔ Mixed Number Multiplication

Mixed Number Multiplication with Step-by-Step Conversion

214×123= 2\frac{1}{4}\times1\frac{2}{3}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:04 Let's solve this problem together!
00:07 First, convert the mixed fractions into improper fractions.
00:21 Calculate the numerators next. Ready?
00:33 Remember, multiply numerator with numerator, and denominator with denominator.
00:43 Great job! Now, let's calculate these products.
00:49 Now, let's convert the result back into a mixed fraction.
00:54 Break down 45 into 36 plus 9. Simple, right?
01:00 Separate the fraction into a whole number and the remainder.
01:04 Remember to reduce the fraction whenever possible.
01:08 Convert the fraction into a whole number, and combine with the mixed number.
01:14 And there you have it, that's the solution!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

214×123= 2\frac{1}{4}\times1\frac{2}{3}=

2

Step-by-step solution

To solve the problem of multiplying the mixed numbers 214 2\frac{1}{4} and 123 1\frac{2}{3} , we proceed as follows:

  • Step 1: Convert Mixed Numbers to Improper Fractions

    • Convert 214 2\frac{1}{4} to an improper fraction: 214=2×4+14=94 2\frac{1}{4} = \frac{2 \times 4 + 1}{4} = \frac{9}{4}

    • Convert 123 1\frac{2}{3} to an improper fraction: 123=1×3+23=53 1\frac{2}{3} = \frac{1 \times 3 + 2}{3} = \frac{5}{3}

  • Step 2: Multiply the Improper Fractions

  • Now, multiply 94\frac{9}{4} by 53\frac{5}{3}: 94×53=9×54×3=4512 \frac{9}{4} \times \frac{5}{3} = \frac{9 \times 5}{4 \times 3} = \frac{45}{12}

  • Step 3: Simplify the Fraction

  • Simplify 4512\frac{45}{12} by finding the greatest common divisor of 45 and 12, which is 3: 45÷312÷3=154 \frac{45 \div 3}{12 \div 3} = \frac{15}{4}

  • Step 4: Convert Back to a Mixed Number

  • Convert 154\frac{15}{4} into a mixed number: 15÷4=3remainder3 15 \div 4 = 3 \quad \text{remainder} \quad 3 So, 154=334\frac{15}{4} = 3\frac{3}{4}.

Based on the calculations, the product of 214 2\frac{1}{4} and 123 1\frac{2}{3} is 334 3\frac{3}{4} .

Therefore, the solution to the problem is 334 3\frac{3}{4} .

3

Final Answer

334 3\frac{3}{4}

Key Points to Remember

Essential concepts to master this topic
  • Conversion Rule: Convert mixed numbers to improper fractions first
  • Technique: 214=94 2\frac{1}{4} = \frac{9}{4} by multiplying whole × denominator + numerator
  • Check: Convert final improper fraction back to mixed number: 154=334 \frac{15}{4} = 3\frac{3}{4}

Common Mistakes

Avoid these frequent errors
  • Multiplying whole numbers and fractions separately
    Don't multiply 2 × 1 = 2 and 14×23=212 \frac{1}{4} × \frac{2}{3} = \frac{2}{12} separately = 2212 2\frac{2}{12} which is wrong! This ignores the interaction between whole and fractional parts. Always convert to improper fractions first, then multiply as single fractions.

Practice Quiz

Test your knowledge with interactive questions

\( 1\frac{4}{5}\times1\frac{1}{3}= \)

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 are single values, not separate parts! 214 2\frac{1}{4} means 2 AND 14 \frac{1}{4} combined. Multiplying parts separately ignores how they work together as one number.

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

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Formula: Multiply whole number × denominator, then add numerator. For 214 2\frac{1}{4} : (2 × 4) + 1 = 9, so it becomes 94 \frac{9}{4} .

Do I always need to simplify my answer?

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Yes! Always check if your fraction can be simplified. 4512 \frac{45}{12} simplifies to 154 \frac{15}{4} by dividing both parts by their GCD of 3.

How do I know when to convert back to a mixed number?

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If your improper fraction has a numerator larger than the denominator, convert it to a mixed number. Divide: 15÷4=3 15 ÷ 4 = 3 remainder 3 3 , giving 334 3\frac{3}{4} .

What if I get confused during the multiplication step?

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Remember: numerator × numerator, denominator × denominator. So 94×53=9×54×3=4512 \frac{9}{4} × \frac{5}{3} = \frac{9×5}{4×3} = \frac{45}{12} . Take it step by step!

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