Add 42/18 and 24/21
1st number: 2 6/18, 2nd number: 1 3/21
42/18 + 24/21 is 73/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
42/18 = 42 × 7/18 × 7 = 294/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
24/21 = 24 × 6/21 × 6 = 144/126 - Add the two like fractions:
294/126 + 144/126 = 294 + 144/126 = 438/126 - 438/126 simplified gives 73/21
- So, 42/18 + 24/21 = 73/21
In mixed form: 310/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/18+24/21 42/18+48/21 42/36+24/21 42/18+24/42 42/18+72/21 42/54+24/21 42/18+24/63 42/90+24/21