Subtract 9/42 from 8/40
8/40 - 9/42 is -1/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
8/40 = 8 × 21/40 × 21 = 168/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
9/42 = 9 × 20/42 × 20 = 180/840 - Subtract the two like fractions:
168/840 - 180/840 = 168 - 180/840 = -12/840 - After reducing the fraction, the answer is -1/70
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