Subtract 1/21 from 12/90
12/90 - 1/21 is 3/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
12/90 = 12 × 7/90 × 7 = 84/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
1/21 = 1 × 30/21 × 30 = 30/630 - Subtract the two like fractions:
84/630 - 30/630 = 84 - 30/630 = 54/630 - After reducing the fraction, the answer is 3/35
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