Subtract 16/20 from 21/45
21/45 - 16/20 is -1/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,
21/45 = 21 × 4/45 × 4 = 84/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
16/20 = 16 × 9/20 × 9 = 144/180 - Subtract the two like fractions:
84/180 - 144/180 = 84 - 144/180 = -60/180 - After reducing the fraction, the answer is -1/3
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