Add 30/21 and 18/60
1st number: 1 9/21, 2nd number: 18/60
30/21 + 18/60 is 121/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
30/21 = 30 × 20/21 × 20 = 600/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
18/60 = 18 × 7/60 × 7 = 126/420 - Add the two like fractions:
600/420 + 126/420 = 600 + 126/420 = 726/420 - 726/420 simplified gives 121/70
- So, 30/21 + 18/60 = 121/70
In mixed form: 151/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+18/60 30/21+36/60 30/42+18/60 90/21+18/60 30/21+54/60 30/63+18/60 30/21+90/60