Add 96/21 and 42/15, Solve 4 12/21 + 2 12/15 as a fraction

Add 96/21 and 42/15

1^st number: 4 12/21, 2^nd number: 2 12/15

96/21 + 42/15 is 258/35.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 15 is 105

Next, find the equivalent fraction of both fractional numbers with denominator 105
For the 1st fraction, since 21 × 5 = 105,
96/21 = 96 × 5/21 × 5 = 480/105
Likewise, for the 2nd fraction, since 15 × 7 = 105,
42/15 = 42 × 7/15 × 7 = 294/105
Add the two like fractions:
480/105 + 294/105 = 480 + 294/105 = 774/105
774/105 simplified gives 258/35
So, 96/21 + 42/15 = 258/35
In mixed form: 713/35

MathStep (Works offline)

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