Add 20/42 and 12/10, Solve 20/42 + 1 2/10 as a fraction

Add 20/42 and 12/10

1^st number: 20/42, 2^nd number: 1 2/10

20/42 + 12/10 is 176/105.

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,
20/42 = 20 × 5/42 × 5 = 100/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
12/10 = 12 × 21/10 × 21 = 252/210
Add the two like fractions:
100/210 + 252/210 = 100 + 252/210 = 352/210
352/210 simplified gives 176/105
So, 20/42 + 12/10 = 176/105
In mixed form: 171/105

MathStep (Works offline)

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