Add 90/21 and 70/10
1st number: 4 6/21, 2nd number: 7 0/10
90/21 + 70/10 is 79/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
90/21 = 90 × 10/21 × 10 = 900/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
70/10 = 70 × 21/10 × 21 = 1470/210 - Add the two like fractions:
900/210 + 1470/210 = 900 + 1470/210 = 2370/210 - 2370/210 simplified gives 79/7
- So, 90/21 + 70/10 = 79/7
In mixed form: 112/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42+70/10 90/21+70/20 90/63+70/10 90/21+70/30 90/21+70/50