Add 72/70 and 20/40
1st number: 1 2/70, 2nd number: 20/40
72/70 + 20/40 is 107/70.
Steps for adding 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,
20/40 = 20 × 7/40 × 7 = 140/280 - Add the two like fractions:
288/280 + 140/280 = 288 + 140/280 = 428/280 - 428/280 simplified gives 107/70
- So, 72/70 + 20/40 = 107/70
In mixed form: 137/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/70+20/80 72/70+60/40