Subtract 70/80 from 42/15
1st number: 2 12/15, 2nd number: 70/80
42/15 - 70/80 is 77/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 15 × 16 = 240,
42/15 = 42 × 16/15 × 16 = 672/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
70/80 = 70 × 3/80 × 3 = 210/240 - Subtract the two like fractions:
672/240 - 210/240 = 672 - 210/240 = 462/240 - After reducing the fraction, the answer is 77/40
- In mixed form: 137/40
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