Subtract 56/42 from 20/45
1st number: 20/45, 2nd number: 1 14/42
20/45 - 56/42 is -8/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 42 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 45 × 14 = 630,
20/45 = 20 × 14/45 × 14 = 280/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
56/42 = 56 × 15/42 × 15 = 840/630 - Subtract the two like fractions:
280/630 - 840/630 = 280 - 840/630 = -560/630 - After reducing the fraction, the answer is -8/9
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