Subtract 30/40 from 72/70
1st number: 1 2/70, 2nd number: 30/40
72/70 - 30/40 is 39/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
72/70 = 72 × 4/70 × 4 = 288/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
30/40 = 30 × 7/40 × 7 = 210/280 - Subtract the two like fractions:
288/280 - 210/280 = 288 - 210/280 = 78/280 - After reducing the fraction, the answer is 39/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/70-60/40 72/70-30/80 72/70-90/40