Subtract 20/42 from 42/45
42/45 - 20/42 is 16/35.
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,
42/45 = 42 × 14/45 × 14 = 588/630 - Likewise, for the 2nd fraction, since 42 × 15 = 630,
20/42 = 20 × 15/42 × 15 = 300/630 - Subtract the two like fractions:
588/630 - 300/630 = 588 - 300/630 = 288/630 - After reducing the fraction, the answer is 16/35
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