Subtract 21/90 from 1/8
1/8 - 21/90 is -13/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 90 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 8 × 45 = 360,
1/8 = 1 × 45/8 × 45 = 45/360 - Likewise, for the 2nd fraction, since 90 × 4 = 360,
21/90 = 21 × 4/90 × 4 = 84/360 - Subtract the two like fractions:
45/360 - 84/360 = 45 - 84/360 = -39/360 - After reducing the fraction, the answer is -13/120
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