Add 30/60 and 1/21
30/60 + 1/21 is 23/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,
30/60 = 30 × 7/60 × 7 = 210/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
1/21 = 1 × 20/21 × 20 = 20/420 - Add the two like fractions:
210/420 + 20/420 = 210 + 20/420 = 230/420 - 230/420 simplified gives 23/42
- So, 30/60 + 1/21 = 23/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/60+2/21 30/60+1/42 90/60+1/21 30/60+3/21 30/60+1/63 30/60+5/21 30/60+7/21