Subtract 70/63 from 42/40
1st number: 1 2/40, 2nd number: 1 7/63
42/40 - 70/63 is -11/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 63 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 40 × 63 = 2520,
42/40 = 42 × 63/40 × 63 = 2646/2520 - Likewise, for the 2nd fraction, since 63 × 40 = 2520,
70/63 = 70 × 40/63 × 40 = 2800/2520 - Subtract the two like fractions:
2646/2520 - 2800/2520 = 2646 - 2800/2520 = -154/2520 - After reducing the fraction, the answer is -11/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/40-70/63 42/80-70/63