Subtract 21/10 from 90/21
1st number: 4 6/21, 2nd number: 2 1/10
90/21 - 21/10 is 153/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
90/21 = 90 × 10/21 × 10 = 900/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
21/10 = 21 × 21/10 × 21 = 441/210 - Subtract the two like fractions:
900/210 - 441/210 = 900 - 441/210 = 459/210 - After reducing the fraction, the answer is 153/70
- In mixed form: 213/70
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