Subtract 4/40 from 21/30
21/30 - 4/40 is 3/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
21/30 = 21 × 4/30 × 4 = 84/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
4/40 = 4 × 3/40 × 3 = 12/120 - Subtract the two like fractions:
84/120 - 12/120 = 84 - 12/120 = 72/120 - After reducing the fraction, the answer is 3/5
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