Multiply Mixed Numbers: 1⅞ × 2⅓ Step-by-Step Solution

Mixed Number Multiplication with Improper Conversion

168×226= 1\frac{6}{8}\times2\frac{2}{6}=

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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's possible
00:27 Convert mixed numbers to fractions
00:40 Calculate the numerators
00:48 Make sure to multiply numerator by numerator and denominator by denominator
00:52 Calculate the multiplications
00:59 Now convert to mixed number
01:02 Break down 49 into 48 plus 1
01:07 Break down the fraction into whole number and remainder
01:12 Convert whole fraction to whole number, and combine with mixed number
01:16 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

168×226= 1\frac{6}{8}\times2\frac{2}{6}=

2

Step-by-step solution

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

  • Step 1: Convert each mixed number to an improper fraction.
  • Step 2: Multiply the improper fractions.
  • Step 3: Simplify the resulting fraction.
  • Step 4: Convert the improper fraction back to a mixed number if necessary.

Let's begin:

Step 1: Convert to improper fractions
Convert 1681\frac{6}{8} to an improper fraction:
8×1+68=148\frac{8 \times 1 + 6}{8} = \frac{14}{8}.

Convert 2262\frac{2}{6} to an improper fraction:
6×2+26=146\frac{6 \times 2 + 2}{6} = \frac{14}{6}.

Step 2: Multiply the fractions
Multiply 148\frac{14}{8} and 146\frac{14}{6}:
148×146=19648\frac{14}{8} \times \frac{14}{6} = \frac{196}{48}.

Step 3: Simplify the fraction
Find the greatest common divisor (GCD) of 196 and 48, which is 4. Simplify 19648\frac{196}{48}:
196÷448÷4=4912\frac{196 \div 4}{48 \div 4} = \frac{49}{12}.

Step 4: Convert to a mixed number
4912\frac{49}{12} as a mixed number is 41124\frac{1}{12} since 49 divided by 12 is 4 with a remainder of 1.

Therefore, the solution to the problem is 4112 4\frac{1}{12} .

3

Final Answer

4112 4\frac{1}{12}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions before multiplying
  • Technique: For 168 1\frac{6}{8} , calculate 8×1+68=148 \frac{8 \times 1 + 6}{8} = \frac{14}{8}
  • Check: Simplify final fraction and convert back to mixed number ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying whole and fractional parts separately
    Don't multiply 1 × 2 = 2 and then 68×26=1248 \frac{6}{8} \times \frac{2}{6} = \frac{12}{48} separately = wrong answer of 21248 2\frac{12}{48} ! This ignores how mixed numbers work together. Always convert to improper fractions first, then multiply as single fractions.

Practice Quiz

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

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 168×226 1\frac{6}{8} \times 2\frac{2}{6} , you're multiplying all parts together, which only works correctly with improper fractions.

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

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Use this formula: Improper fraction = (denominator × whole number + numerator) ÷ denominator. For 168 1\frac{6}{8} : 8×1+68=148 \frac{8 \times 1 + 6}{8} = \frac{14}{8}

Do I always need to simplify my answer?

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Yes! Always check if your fraction can be simplified by finding the GCD. In this problem, 19648 \frac{196}{48} simplifies to 4912 \frac{49}{12} by dividing both by 4.

When do I convert back to a mixed number?

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Convert back when your improper fraction is larger than 1 (numerator > denominator). Since 4912 \frac{49}{12} has 49 > 12, it becomes 4112 4\frac{1}{12} .

What if my fractions have different denominators?

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That's normal! When multiplying fractions, you multiply across: numerator × numerator and denominator × denominator. You don't need a common denominator like in addition.

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