Subtract 2/21 from 90/42
1st number: 2 6/42, 2nd number: 2/21
90/42 - 2/21 is 43/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
90/42 = 90 × 1/42 × 1 = 90/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
2/21 = 2 × 2/21 × 2 = 4/42 - Subtract the two like fractions:
90/42 - 4/42 = 90 - 4/42 = 86/42 - After reducing the fraction, the answer is 43/21
- In mixed form: 21/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42-4/21 90/84-2/21 90/42-2/42 90/42-6/21 90/42-2/63 90/42-10/21 90/42-14/21