Subtract 90/21 from 1/2
1st number: 1/2, 2nd number: 4 6/21
1/2 - 90/21 is -53/14.
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,
1/2 = 1 × 21/2 × 21 = 21/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
90/21 = 90 × 2/21 × 2 = 180/42 - Subtract the two like fractions:
21/42 - 180/42 = 21 - 180/42 = -159/42 - After reducing the fraction, the answer is -53/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 1/4-90/21 1/2-90/42 3/2-90/21 1/6-90/21 1/2-90/63 5/2-90/21 1/10-90/21 7/2-90/21 1/14-90/21