Subtract 3/40 from 90/42
1st number: 2 6/42, 2nd number: 3/40
90/42 - 3/40 is 579/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 42 × 20 = 840,
90/42 = 90 × 20/42 × 20 = 1800/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
3/40 = 3 × 21/40 × 21 = 63/840 - Subtract the two like fractions:
1800/840 - 63/840 = 1800 - 63/840 = 1737/840 - After reducing the fraction, the answer is 579/280
- In mixed form: 219/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42-6/40 90/84-3/40 90/42-3/80 90/42-9/40 90/42-15/40 90/42-21/40