Subtract 9/21 from 90/15
1st number: 6 0/15, 2nd number: 9/21
90/15 - 9/21 is 39/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
90/15 = 90 × 7/15 × 7 = 630/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
9/21 = 9 × 5/21 × 5 = 45/105 - Subtract the two like fractions:
630/105 - 45/105 = 630 - 45/105 = 585/105 - After reducing the fraction, the answer is 39/7
- In mixed form: 54/7
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