Subtract 12/40 from 90/7
1st number: 12 6/7, 2nd number: 12/40
90/7 - 12/40 is 879/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 7 × 40 = 280,
90/7 = 90 × 40/7 × 40 = 3600/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
12/40 = 12 × 7/40 × 7 = 84/280 - Subtract the two like fractions:
3600/280 - 84/280 = 3600 - 84/280 = 3516/280 - After reducing the fraction, the answer is 879/70
- In mixed form: 1239/70
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