Subtract 81/21 from 9/40
1st number: 9/40, 2nd number: 3 18/21
9/40 - 81/21 is -1017/280.
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,
81/21 = 81 × 40/21 × 40 = 3240/840 - Subtract the two like fractions:
189/840 - 3240/840 = 189 - 3240/840 = -3051/840 - After reducing the fraction, the answer is -1017/280
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