Add 21/42 and 16/10, Solve 21/42 + 1 6/10 as a fraction

Add 21/42 and 16/10

1^st number: 21/42, 2^nd number: 1 6/10

21/42 + 16/10 is 21/10.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
16/10 = 16 × 21/10 × 21 = 336/210
Add the two like fractions:
105/210 + 336/210 = 105 + 336/210 = 441/210
441/210 simplified gives 21/10
So, 21/42 + 16/10 = 21/10
In mixed form: 21/10

MathStep (Works offline)

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