Add 21/24 and 30/42
21/24 + 30/42 is 89/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
21/24 = 21 × 7/24 × 7 = 147/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
30/42 = 30 × 4/42 × 4 = 120/168 - Add the two like fractions:
147/168 + 120/168 = 147 + 120/168 = 267/168 - 267/168 simplified gives 89/56
- So, 21/24 + 30/42 = 89/56
In mixed form: 133/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24+30/42 21/24+60/42 21/48+30/42 21/24+30/84 63/24+30/42 21/24+90/42 21/72+30/42