Subtract 90/30 from 4/42
1st number: 4/42, 2nd number: 3 0/30
4/42 - 90/30 is -61/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
4/42 = 4 × 5/42 × 5 = 20/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
90/30 = 90 × 7/30 × 7 = 630/210 - Subtract the two like fractions:
20/210 - 630/210 = 20 - 630/210 = -610/210 - After reducing the fraction, the answer is -61/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/42-90/30 4/84-90/30 4/42-90/60 12/42-90/30 20/42-90/30 28/42-90/30