Subtract 45/21 from 5/40
1st number: 5/40, 2nd number: 2 3/21
5/40 - 45/21 is -113/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 21 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
5/40 = 5 × 21/40 × 21 = 105/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
45/21 = 45 × 40/21 × 40 = 1800/840 - Subtract the two like fractions:
105/840 - 1800/840 = 105 - 1800/840 = -1695/840 - After reducing the fraction, the answer is -113/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/40-45/21 5/40-90/21 5/80-45/21 5/40-45/42 15/40-45/21 5/40-45/63 25/40-45/21 35/40-45/21