Multiply Mixed Numbers: 1 4/12 × 1 4/14 Step-by-Step

Mixed Number Multiplication with Fraction Simplification

1412×1414= 1\frac{4}{12}\times1\frac{4}{14}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Let's reduce what we can
00:33 Convert mixed fractions to fractions
00:46 Calculate the numerators
00:53 Make sure to multiply numerator by numerator and denominator by denominator
00:58 Calculate the products
01:02 Now convert to mixed fraction
01:07 Break down 36 to 21 plus 15
01:14 Break down the fraction into whole number and remainder
01:19 Convert proper fraction to whole number, and add to mixed number
01:27 Let's reduce what we can
01:35 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

1412×1414= 1\frac{4}{12}\times1\frac{4}{14}=

2

Step-by-step solution

Let's solve the problem by following these steps:

  • Step 1: Convert the mixed numbers to improper fractions.
  • Step 2: Multiply the improper fractions.
  • Step 3: Simplify the resulting fraction and convert back to a mixed number if needed.

Step 1:
Convert 14121\frac{4}{12} to an improper fraction.

Calculate the improper fraction: 1412=1×12+412=1612 1\frac{4}{12} = \frac{1 \times 12 + 4}{12} = \frac{16}{12}

Convert 14141\frac{4}{14} to an improper fraction.

Calculate the improper fraction: 1414=1×14+414=1814 1\frac{4}{14} = \frac{1 \times 14 + 4}{14} = \frac{18}{14}

Step 2:
Multiply the two improper fractions:

1612×1814=16×1812×14 \frac{16}{12} \times \frac{18}{14} = \frac{16 \times 18}{12 \times 14}

Simplify the multiplication:

  • Numerator: 16×18=28816 \times 18 = 288
  • Denominator: 12×14=16812 \times 14 = 168

The resulting fraction is 288168\frac{288}{168}.

Step 3:
Simplify 288168\frac{288}{168}.

Find the greatest common divisor (GCD) of 288 and 168, which is 24.

  • Divide numerator by GCD: 288÷24=12288 \div 24 = 12
  • Divide denominator by GCD: 168÷24=7168 \div 24 = 7

The simplified fraction is 127\frac{12}{7}.

Convert 127\frac{12}{7} back to a mixed number:

12 divided by 7 is 1 with a remainder of 5, so the mixed number is 1571\frac{5}{7}.

Thus, the solution to the problem is 157\boxed{1\frac{5}{7}}.

3

Final Answer

157 1\frac{5}{7}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert mixed numbers to improper fractions before multiplying
  • Technique: 1412=1612 1\frac{4}{12} = \frac{16}{12} using whole × denominator + numerator
  • Check: Simplify final answer and verify: 288168÷24=127=157 \frac{288}{168} ÷ 24 = \frac{12}{7} = 1\frac{5}{7}

Common Mistakes

Avoid these frequent errors
  • Multiplying whole numbers and fractions separately
    Don't multiply 1 × 1 = 1 and 412×414 \frac{4}{12} × \frac{4}{14} separately = wrong method! This ignores how mixed numbers work as single values. Always convert to improper fractions first, then multiply numerator by numerator and denominator by denominator.

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 a mixed number like 1412 1\frac{4}{12} represents one complete value, not separate parts. When you multiply mixed numbers, you're multiplying the entire quantities, so you need to work with improper fractions.

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

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Use the formula: whole number × denominator + numerator, all over the original denominator. For 1412 1\frac{4}{12} : 1×12+412=1612 \frac{1 × 12 + 4}{12} = \frac{16}{12}

Do I always need to simplify fractions before multiplying?

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Not necessarily before, but you should always simplify your final answer. You can also look for common factors to cancel during multiplication to make calculations easier.

How do I know what the GCD is?

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List the factors of both numbers and find the largest one they share. For 288 and 168: both are divisible by 24. You can also use prime factorization or the Euclidean algorithm.

What if my final answer is an improper fraction?

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Convert it back to a mixed number! Divide the numerator by the denominator: 127=12÷7=1 \frac{12}{7} = 12 ÷ 7 = 1 remainder 5 5 , so the answer is 157 1\frac{5}{7} .

Can I use a calculator for the multiplication?

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Yes, but make sure you understand the step-by-step process! Converting to decimals might give rounding errors, so working with fractions throughout is often more accurate.

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