Subtract 98/80 from 72/70
1st number: 1 2/70, 2nd number: 1 18/80
72/70 - 98/80 is -11/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 70 × 8 = 560,
72/70 = 72 × 8/70 × 8 = 576/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
98/80 = 98 × 7/80 × 7 = 686/560 - Subtract the two like fractions:
576/560 - 686/560 = 576 - 686/560 = -110/560 - After reducing the fraction, the answer is -11/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: