Subtract 16/70 from 42/90
42/90 - 16/70 is 5/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
42/90 = 42 × 7/90 × 7 = 294/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
16/70 = 16 × 9/70 × 9 = 144/630 - Subtract the two like fractions:
294/630 - 144/630 = 294 - 144/630 = 150/630 - After reducing the fraction, the answer is 5/21
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