Subtract 45/90 from 81/12
1st number: 6 9/12, 2nd number: 45/90
81/12 - 45/90 is 25/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
81/12 = 81 × 15/12 × 15 = 1215/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
45/90 = 45 × 2/90 × 2 = 90/180 - Subtract the two like fractions:
1215/180 - 90/180 = 1215 - 90/180 = 1125/180 - After reducing the fraction, the answer is 25/4
- In mixed form: 61/4
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