Add 30/70 and 21/60
30/70 + 21/60 is 109/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 70 × 6 = 420,
30/70 = 30 × 6/70 × 6 = 180/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
21/60 = 21 × 7/60 × 7 = 147/420 - Add the two like fractions:
180/420 + 147/420 = 180 + 147/420 = 327/420 - 327/420 simplified gives 109/140
- So, 30/70 + 21/60 = 109/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70+21/60 30/70+42/60 90/70+21/60 30/70+63/60