Add 40/21 and 70/60, Solve 1 19/21 + 1 10/60 as a fraction

Add 40/21 and 70/60

1^st number: 1 19/21, 2^nd number: 1 10/60

40/21 + 70/60 is 43/14.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 21 × 20 = 420,
40/21 = 40 × 20/21 × 20 = 800/420
Likewise, for the 2nd fraction, since 60 × 7 = 420,
70/60 = 70 × 7/60 × 7 = 490/420
Add the two like fractions:
800/420 + 490/420 = 800 + 490/420 = 1290/420
1290/420 simplified gives 43/14
So, 40/21 + 70/60 = 43/14
In mixed form: 31/14

MathStep (Works offline)

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