Add 70/42 and 63/20, Solve 1 28/42 + 3 3/20 as a fraction

Add 70/42 and 63/20

1^st number: 1 28/42, 2^nd number: 3 3/20

70/42 + 63/20 is 289/60.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 42 × 10 = 420,
70/42 = 70 × 10/42 × 10 = 700/420
Likewise, for the 2nd fraction, since 20 × 21 = 420,
63/20 = 63 × 21/20 × 21 = 1323/420
Add the two like fractions:
700/420 + 1323/420 = 700 + 1323/420 = 2023/420
2023/420 simplified gives 289/60
So, 70/42 + 63/20 = 289/60
In mixed form: 449/60

MathStep (Works offline)

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