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Multiplication with Fractions
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Multiplying fractions is simple.
- Unlike adding and subtracting, where care must be taken to ensure that both fractions have a common denominator.
- The multiplication operation has no such requirement.
Method 1
- Just multiply the numerators (top numbers) and the denomominators (bottom numbers)
- Place the resulting answers in their respective top / bottom location in the answer fraction.
- Then reduce the fraction, if possible.
Method 2
- Before multiplying the numerators and denominators, look for ways to pre-reduce the fractions, both within each fraction, and across the fractions.
Example 1: Pre-reducing within a fraction
2/4 x 1/5 = ?
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First reduce the 2/4 to 1/2
- Then multiply the numerators (top numbers), and the denominators (bottom numbers)
- Place the resulting answers in their respective top / bottom location in the answer fraction.
- Then reduce the fraction, if possible.
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2/4 X 1/5 = 1/2 X 1/5 = 1/10
Example 2: Reducing across fractions
6/4 X 1/6
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Here we divide the first numerator (6) by the second denominator (6)
- Before multiplying the numerators (top numbers), and the denomominators (bottom numbers).
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6/4 X 1/6 = 1/4 X 1/1 = 1/4
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