Add 2/21 and 70/18, Solve 2/21 + 3 16/18 as a fraction

Add 2/21 and 70/18

1^st number: 2/21, 2^nd number: 3 16/18

2/21 + 70/18 is 251/63.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 21 × 6 = 126,
2/21 = 2 × 6/21 × 6 = 12/126
Likewise, for the 2nd fraction, since 18 × 7 = 126,
70/18 = 70 × 7/18 × 7 = 490/126
Add the two like fractions:
12/126 + 490/126 = 12 + 490/126 = 502/126
502/126 simplified gives 251/63
So, 2/21 + 70/18 = 251/63
In mixed form: 362/63

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad