Subtract 21/90 from 2/4
2/4 - 21/90 is 4/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 4 × 45 = 180,
2/4 = 2 × 45/4 × 45 = 90/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
21/90 = 21 × 2/90 × 2 = 42/180 - Subtract the two like fractions:
90/180 - 42/180 = 90 - 42/180 = 48/180 - After reducing the fraction, the answer is 4/15
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