Add 21/35 and 70/60, Solve 21/35 + 1 10/60 as a fraction

Add 21/35 and 70/60

1^st number: 21/35, 2^nd number: 1 10/60

21/35 + 70/60 is 53/30.

Find the least common denominator or LCM of the two denominators:
LCM of 35 and 60 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 35 × 12 = 420,
21/35 = 21 × 12/35 × 12 = 252/420
Likewise, for the 2nd fraction, since 60 × 7 = 420,
70/60 = 70 × 7/60 × 7 = 490/420
Add the two like fractions:
252/420 + 490/420 = 252 + 490/420 = 742/420
742/420 simplified gives 53/30
So, 21/35 + 70/60 = 53/30
In mixed form: 123/30

MathStep (Works offline)

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