Add 90/84 and 40/60, Solve 1 6/84 + 40/60 as a fraction

Add 90/84 and 40/60

1^st number: 1 6/84, 2^nd number: 40/60

90/84 + 40/60 is 73/42.

Find the least common denominator or LCM of the two denominators:
LCM of 84 and 60 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 84 × 5 = 420,
90/84 = 90 × 5/84 × 5 = 450/420
Likewise, for the 2nd fraction, since 60 × 7 = 420,
40/60 = 40 × 7/60 × 7 = 280/420
Add the two like fractions:
450/420 + 280/420 = 450 + 280/420 = 730/420
730/420 simplified gives 73/42
So, 90/84 + 40/60 = 73/42
In mixed form: 131/42

MathStep (Works offline)

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