Add 25/21 and 18/84, Solve 1 4/21 + 18/84 as a fraction

Add 25/21 and 18/84

1^st number: 1 4/21, 2^nd number: 18/84

25/21 + 18/84 is 59/42.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 84 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 21 × 4 = 84,
25/21 = 25 × 4/21 × 4 = 100/84
Likewise, for the 2nd fraction, since 84 × 1 = 84,
18/84 = 18 × 1/84 × 1 = 18/84
Add the two like fractions:
100/84 + 18/84 = 100 + 18/84 = 118/84
118/84 simplified gives 59/42
So, 25/21 + 18/84 = 59/42
In mixed form: 117/42

MathStep (Works offline)

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