Subtract 40/21 from 45/36
1st number: 1 9/36, 2nd number: 1 19/21
45/36 - 40/21 is -55/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
45/36 = 45 × 7/36 × 7 = 315/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
40/21 = 40 × 12/21 × 12 = 480/252 - Subtract the two like fractions:
315/252 - 480/252 = 315 - 480/252 = -165/252 - After reducing the fraction, the answer is -55/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/36-40/21 45/36-80/21 45/72-40/21 45/36-40/42 45/36-40/63