Subtract 28/70 from 81/90
81/90 - 28/70 is 1/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
81/90 = 81 × 7/90 × 7 = 567/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
28/70 = 28 × 9/70 × 9 = 252/630 - Subtract the two like fractions:
567/630 - 252/630 = 567 - 252/630 = 315/630 - After reducing the fraction, the answer is 1/2
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