Subtract 20/7 from 12/90
1st number: 12/90, 2nd number: 2 6/7
12/90 - 20/7 is -286/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 7 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
12/90 = 12 × 7/90 × 7 = 84/630 - Likewise, for the 2nd fraction, since 7 × 90 = 630,
20/7 = 20 × 90/7 × 90 = 1800/630 - Subtract the two like fractions:
84/630 - 1800/630 = 84 - 1800/630 = -1716/630 - After reducing the fraction, the answer is -286/105
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