Subtract 70/40 from 8/7
1st number: 1 1/7, 2nd number: 1 30/40
8/7 - 70/40 is -17/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 7 × 40 = 280,
8/7 = 8 × 40/7 × 40 = 320/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
70/40 = 70 × 7/40 × 7 = 490/280 - Subtract the two like fractions:
320/280 - 490/280 = 320 - 490/280 = -170/280 - After reducing the fraction, the answer is -17/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/7-70/40 8/14-70/40 8/7-70/80 24/7-70/40 8/21-70/40 40/7-70/40 8/35-70/40 56/7-70/40 8/49-70/40