Subtract 9/40 from 9/72
9/72 - 9/40 is -1/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 72 × 5 = 360,
9/72 = 9 × 5/72 × 5 = 45/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
9/40 = 9 × 9/40 × 9 = 81/360 - Subtract the two like fractions:
45/360 - 81/360 = 45 - 81/360 = -36/360 - After reducing the fraction, the answer is -1/10
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