Add 90/30 and 6/21
1st number: 3 0/30, 2nd number: 6/21
90/30 + 6/21 is 23/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
90/30 = 90 × 7/30 × 7 = 630/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
6/21 = 6 × 10/21 × 10 = 60/210 - Add the two like fractions:
630/210 + 60/210 = 630 + 60/210 = 690/210 - 690/210 simplified gives 23/7
- So, 90/30 + 6/21 = 23/7
In mixed form: 32/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30+12/21 90/60+6/21 90/30+6/42 90/30+18/21 90/30+6/63 90/30+30/21 90/30+42/21