Subtract 42/40 from 84/15
1st number: 5 9/15, 2nd number: 1 2/40
84/15 - 42/40 is 91/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
84/15 = 84 × 8/15 × 8 = 672/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
42/40 = 42 × 3/40 × 3 = 126/120 - Subtract the two like fractions:
672/120 - 126/120 = 672 - 126/120 = 546/120 - After reducing the fraction, the answer is 91/20
- In mixed form: 411/20
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