Add 90/30 and 16/21
1st number: 3 0/30, 2nd number: 16/21
90/30 + 16/21 is 79/21.
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,
16/21 = 16 × 10/21 × 10 = 160/210 - Add the two like fractions:
630/210 + 160/210 = 630 + 160/210 = 790/210 - 790/210 simplified gives 79/21
- So, 90/30 + 16/21 = 79/21
In mixed form: 316/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30+32/21 90/60+16/21 90/30+16/42 90/30+48/21 90/30+16/63 90/30+80/21