Subtract 27/42 from 90/80
1st number: 1 10/80, 2nd number: 27/42
90/80 - 27/42 is 27/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 42 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 80 × 21 = 1680,
90/80 = 90 × 21/80 × 21 = 1890/1680 - Likewise, for the 2nd fraction, since 42 × 40 = 1680,
27/42 = 27 × 40/42 × 40 = 1080/1680 - Subtract the two like fractions:
1890/1680 - 1080/1680 = 1890 - 1080/1680 = 810/1680 - After reducing the fraction, the answer is 27/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/80-54/42 90/80-27/84 90/80-81/42