Add 90/21 and 10/70
1st number: 4 6/21, 2nd number: 10/70
90/21 + 10/70 is 31/7.
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,
90/21 = 90 × 10/21 × 10 = 900/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
10/70 = 10 × 3/70 × 3 = 30/210 - Add the two like fractions:
900/210 + 30/210 = 900 + 30/210 = 930/210 - 930/210 simplified gives 31/7
- So, 90/21 + 10/70 = 31/7
In mixed form: 43/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+20/70 90/42+10/70 90/21+30/70 90/63+10/70 90/21+50/70