Subtract 45/21 from 24/40
1st number: 24/40, 2nd number: 2 3/21
24/40 - 45/21 is -54/35.
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,
24/40 = 24 × 21/40 × 21 = 504/840 - Likewise, for the 2nd fraction, since 21 × 40 = 840,
45/21 = 45 × 40/21 × 40 = 1800/840 - Subtract the two like fractions:
504/840 - 1800/840 = 504 - 1800/840 = -1296/840 - After reducing the fraction, the answer is -54/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/40-45/21 24/40-90/21 24/80-45/21 24/40-45/42 72/40-45/21 24/40-45/63