Subtract 90/70 from 24/20
1st number: 1 4/20, 2nd number: 1 20/70
24/20 - 90/70 is -3/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 70 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
24/20 = 24 × 7/20 × 7 = 168/140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,
90/70 = 90 × 2/70 × 2 = 180/140 - Subtract the two like fractions:
168/140 - 180/140 = 168 - 180/140 = -12/140 - After reducing the fraction, the answer is -3/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/20-90/70 24/40-90/70 72/20-90/70 24/60-90/70