Subtract 20/8 from 8/21
1st number: 8/21, 2nd number: 2 4/8
8/21 - 20/8 is -89/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
8/21 = 8 × 8/21 × 8 = 64/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
20/8 = 20 × 21/8 × 21 = 420/168 - Subtract the two like fractions:
64/168 - 420/168 = 64 - 420/168 = -356/168 - After reducing the fraction, the answer is -89/42
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