Subtract 20/21 from 35/2
1st number: 17 1/2, 2nd number: 20/21
35/2 - 20/21 is 695/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
35/2 = 35 × 21/2 × 21 = 735/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
20/21 = 20 × 2/21 × 2 = 40/42 - Subtract the two like fractions:
735/42 - 40/42 = 735 - 40/42 = 695/42 - In mixed form: 1623/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/2-20/21 35/2-40/21 35/4-20/21 35/2-20/42 35/2-60/21 35/6-20/21 35/2-20/63 35/10-20/21 35/14-20/21