Add 21/30 and 90/9
1st number: 21/30, 2nd number: 10 0/9
21/30 + 90/9 is 107/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 9 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
21/30 = 21 × 3/30 × 3 = 63/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
90/9 = 90 × 10/9 × 10 = 900/90 - Add the two like fractions:
63/90 + 900/90 = 63 + 900/90 = 963/90 - 963/90 simplified gives 107/10
- So, 21/30 + 90/9 = 107/10
In mixed form: 107/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+90/9 21/60+90/9 21/30+90/18 63/30+90/9 21/90+90/9 21/30+90/27 21/30+90/45 21/30+90/63