Subtract 21/40 from 42/30
1st number: 1 12/30, 2nd number: 21/40
42/30 - 21/40 is 7/8.
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,
42/30 = 42 × 4/30 × 4 = 168/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
21/40 = 21 × 3/40 × 3 = 63/120 - Subtract the two like fractions:
168/120 - 63/120 = 168 - 63/120 = 105/120 - After reducing the fraction, the answer is 7/8
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