Add 21/45 and 2/30
21/45 + 2/30 is 8/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
21/45 = 21 × 2/45 × 2 = 42/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
2/30 = 2 × 3/30 × 3 = 6/90 - Add the two like fractions:
42/90 + 6/90 = 42 + 6/90 = 48/90 - 48/90 simplified gives 8/15
- So, 21/45 + 2/30 = 8/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/45+2/30 21/45+4/30 21/90+2/30 21/45+2/60 63/45+2/30 21/45+6/30 21/45+2/90 21/45+10/30 21/45+14/30