Add 21/70 and 63/14, Solve 21/70 + 4 7/14 as a fraction

Add 21/70 and 63/14

1^st number: 21/70, 2^nd number: 4 7/14

21/70 + 63/14 is 24/5.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 14 is 70

Next, find the equivalent fraction of both fractional numbers with denominator 70
For the 1st fraction, since 70 × 1 = 70,
21/70 = 21 × 1/70 × 1 = 21/70
Likewise, for the 2nd fraction, since 14 × 5 = 70,
63/14 = 63 × 5/14 × 5 = 315/70
Add the two like fractions:
21/70 + 315/70 = 21 + 315/70 = 336/70
336/70 simplified gives 24/5
So, 21/70 + 63/14 = 24/5
In mixed form: 44/5

MathStep (Works offline)

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