Add 70/18 and 24/21
1st number: 3 16/18, 2nd number: 1 3/21
70/18 + 24/21 is 317/63.
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,
70/18 = 70 × 7/18 × 7 = 490/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
24/21 = 24 × 6/21 × 6 = 144/126 - Add the two like fractions:
490/126 + 144/126 = 490 + 144/126 = 634/126 - 634/126 simplified gives 317/63
- So, 70/18 + 24/21 = 317/63
In mixed form: 52/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/18+48/21 70/36+24/21 70/18+24/42 70/18+72/21 70/54+24/21 70/18+24/63 70/90+24/21