Subtract 1/90 from 42/80
42/80 - 1/90 is 37/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 90 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
42/80 = 42 × 9/80 × 9 = 378/720 - Likewise, for the 2nd fraction, since 90 × 8 = 720,
1/90 = 1 × 8/90 × 8 = 8/720 - Subtract the two like fractions:
378/720 - 8/720 = 378 - 8/720 = 370/720 - After reducing the fraction, the answer is 37/72
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