Subtract 16/21 from 4/8
4/8 - 16/21 is -11/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
4/8 = 4 × 21/8 × 21 = 84/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
16/21 = 16 × 8/21 × 8 = 128/168 - Subtract the two like fractions:
84/168 - 128/168 = 84 - 128/168 = -44/168 - After reducing the fraction, the answer is -11/42
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