Add 7/30 and 21/45
7/30 + 21/45 is 7/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 45 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
7/30 = 7 × 3/30 × 3 = 21/90 - Likewise, for the 2nd fraction, since 45 × 2 = 90,
21/45 = 21 × 2/45 × 2 = 42/90 - Add the two like fractions:
21/90 + 42/90 = 21 + 42/90 = 63/90 - 63/90 simplified gives 7/10
- So, 7/30 + 21/45 = 7/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/30+21/45 7/30+42/45 7/60+21/45 7/30+21/90 21/30+21/45 7/30+63/45 7/90+21/45 35/30+21/45 49/30+21/45