Add 90/30 and 75/21
1st number: 3 0/30, 2nd number: 3 12/21
90/30 + 75/21 is 46/7.
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,
75/21 = 75 × 10/21 × 10 = 750/210 - Add the two like fractions:
630/210 + 750/210 = 630 + 750/210 = 1380/210 - 1380/210 simplified gives 46/7
- So, 90/30 + 75/21 = 46/7
In mixed form: 64/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/60+75/21 90/30+75/42 90/30+75/63