Subtract 30/21 from 45/15
1st number: 3 0/15, 2nd number: 1 9/21
45/15 - 30/21 is 11/7.
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,
45/15 = 45 × 7/15 × 7 = 315/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
30/21 = 30 × 5/21 × 5 = 150/105 - Subtract the two like fractions:
315/105 - 150/105 = 315 - 150/105 = 165/105 - After reducing the fraction, the answer is 11/7
- In mixed form: 14/7
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