Add 70/18 and 48/21
1st number: 3 16/18, 2nd number: 2 6/21
70/18 + 48/21 is 389/63.
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,
48/21 = 48 × 6/21 × 6 = 288/126 - Add the two like fractions:
490/126 + 288/126 = 490 + 288/126 = 778/126 - 778/126 simplified gives 389/63
- So, 70/18 + 48/21 = 389/63
In mixed form: 611/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/18+96/21 70/36+48/21 70/18+48/42 70/54+48/21 70/18+48/63 70/90+48/21