Add 10/21 and 72/70
1st number: 10/21, 2nd number: 1 2/70
10/21 + 72/70 is 158/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
10/21 = 10 × 10/21 × 10 = 100/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
72/70 = 72 × 3/70 × 3 = 216/210 - Add the two like fractions:
100/210 + 216/210 = 100 + 216/210 = 316/210 - 316/210 simplified gives 158/105
- So, 10/21 + 72/70 = 158/105
In mixed form: 153/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21+72/70 10/42+72/70 30/21+72/70 10/63+72/70 50/21+72/70 70/21+72/70