Add 72/70 and 3/21
1st number: 1 2/70, 2nd number: 3/21
72/70 + 3/21 is 41/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
72/70 = 72 × 3/70 × 3 = 216/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
3/21 = 3 × 10/21 × 10 = 30/210 - Add the two like fractions:
216/210 + 30/210 = 216 + 30/210 = 246/210 - 246/210 simplified gives 41/35
- So, 72/70 + 3/21 = 41/35
In mixed form: 16/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/70+6/21 72/70+3/42 72/70+9/21 72/70+3/63 72/70+15/21