Subtract 36/90 from 4/21
4/21 - 36/90 is -22/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
4/21 = 4 × 30/21 × 30 = 120/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
36/90 = 36 × 7/90 × 7 = 252/630 - Subtract the two like fractions:
120/630 - 252/630 = 120 - 252/630 = -132/630 - After reducing the fraction, the answer is -22/105
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