Add 54/30 and 21/42
1st number: 1 24/30, 2nd number: 21/42
54/30 + 21/42 is 23/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
54/30 = 54 × 7/30 × 7 = 378/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210 - Add the two like fractions:
378/210 + 105/210 = 378 + 105/210 = 483/210 - 483/210 simplified gives 23/10
- So, 54/30 + 21/42 = 23/10
In mixed form: 23/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/60+21/42 54/30+21/84 54/30+63/42 54/90+21/42