Subtract 9/7 from 40/84
1st number: 40/84, 2nd number: 1 2/7
40/84 - 9/7 is -17/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
40/84 = 40 × 1/84 × 1 = 40/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
9/7 = 9 × 12/7 × 12 = 108/84 - Subtract the two like fractions:
40/84 - 108/84 = 40 - 108/84 = -68/84 - After reducing the fraction, the answer is -17/21
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