Subtract 1/21 from 90/3
1st number: 30 0/3, 2nd number: 1/21
90/3 - 1/21 is 629/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
90/3 = 90 × 7/3 × 7 = 630/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
1/21 = 1 × 1/21 × 1 = 1/21 - Subtract the two like fractions:
630/21 - 1/21 = 630 - 1/21 = 629/21 - In mixed form: 2920/21
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