Add 28/40 and 90/84, Solve 28/40 + 1 6/84 as a fraction

Add 28/40 and 90/84

1^st number: 28/40, 2^nd number: 1 6/84

28/40 + 90/84 is 62/35.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 84 is 840

Next, find the equivalent fraction of both fractional numbers with denominator 840
For the 1st fraction, since 40 × 21 = 840,
28/40 = 28 × 21/40 × 21 = 588/840
Likewise, for the 2nd fraction, since 84 × 10 = 840,
90/84 = 90 × 10/84 × 10 = 900/840
Add the two like fractions:
588/840 + 900/840 = 588 + 900/840 = 1488/840
1488/840 simplified gives 62/35
So, 28/40 + 90/84 = 62/35
In mixed form: 127/35

MathStep (Works offline)

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