Subtract 21/40 from 9/90
9/90 - 21/40 is -17/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
9/90 = 9 × 4/90 × 4 = 36/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
21/40 = 21 × 9/40 × 9 = 189/360 - Subtract the two like fractions:
36/360 - 189/360 = 36 - 189/360 = -153/360 - After reducing the fraction, the answer is -17/40
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