Subtract 70/63 from 15/40
1st number: 15/40, 2nd number: 1 7/63
15/40 - 70/63 is -53/72.
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,
15/40 = 15 × 63/40 × 63 = 945/2520 - Likewise, for the 2nd fraction, since 63 × 40 = 2520,
70/63 = 70 × 40/63 × 40 = 2800/2520 - Subtract the two like fractions:
945/2520 - 2800/2520 = 945 - 2800/2520 = -1855/2520 - After reducing the fraction, the answer is -53/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/40-70/63 15/80-70/63 45/40-70/63 75/40-70/63