Add 18/70 and 98/21, Solve 18/70 + 4 14/21 as a fraction

Add 18/70 and 98/21

1^st number: 18/70, 2^nd number: 4 14/21

18/70 + 98/21 is 517/105.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 70 × 3 = 210,
18/70 = 18 × 3/70 × 3 = 54/210
Likewise, for the 2nd fraction, since 21 × 10 = 210,
98/21 = 98 × 10/21 × 10 = 980/210
Add the two like fractions:
54/210 + 980/210 = 54 + 980/210 = 1034/210
1034/210 simplified gives 517/105
So, 18/70 + 98/21 = 517/105
In mixed form: 497/105

MathStep (Works offline)

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