Subtract 16/18 from 40/21
1st number: 1 19/21, 2nd number: 16/18
40/21 - 16/18 is 64/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
40/21 = 40 × 6/21 × 6 = 240/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
16/18 = 16 × 7/18 × 7 = 112/126 - Subtract the two like fractions:
240/126 - 112/126 = 240 - 112/126 = 128/126 - After reducing the fraction, the answer is 64/63
- In mixed form: 11/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-16/18 40/21-32/18 40/42-16/18 40/21-16/36 40/21-48/18 40/63-16/18 40/21-16/54 40/21-80/18 40/21-16/90