Subtract 42/21 from 9/40
1st number: 9/40, 2nd number: 2 0/21
9/40 - 42/21 is -71/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
9/40 = 9 × 21/40 × 21 = 189/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
42/21 = 42 × 40/21 × 40 = 1680/840 - Subtract the two like fractions:
189/840 - 1680/840 = 189 - 1680/840 = -1491/840 - After reducing the fraction, the answer is -71/40
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