Add 21/7 and 18/10, Solve 3 0/7 + 1 8/10 as a fraction

Add 21/7 and 18/10

1^st number: 3 0/7, 2^nd number: 1 8/10

21/7 + 18/10 is 24/5.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 10 is 70

Next, find the equivalent fraction of both fractional numbers with denominator 70
For the 1st fraction, since 7 × 10 = 70,
21/7 = 21 × 10/7 × 10 = 210/70
Likewise, for the 2nd fraction, since 10 × 7 = 70,
18/10 = 18 × 7/10 × 7 = 126/70
Add the two like fractions:
210/70 + 126/70 = 210 + 126/70 = 336/70
336/70 simplified gives 24/5
So, 21/7 + 18/10 = 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