Subtract 40/30 from 70/40
1st number: 1 30/40, 2nd number: 1 10/30
70/40 - 40/30 is 5/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
70/40 = 70 × 3/40 × 3 = 210/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
40/30 = 40 × 4/30 × 4 = 160/120 - Subtract the two like fractions:
210/120 - 160/120 = 210 - 160/120 = 50/120 - After reducing the fraction, the answer is 5/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/40-80/30 70/80-40/30 70/40-40/60 70/40-40/90