Add 40/42 and 63/8, Solve 40/42 + 7 7/8 as a fraction

Add 40/42 and 63/8

1^st number: 40/42, 2^nd number: 7 7/8

40/42 + 63/8 is 1483/168.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 42 × 4 = 168,
40/42 = 40 × 4/42 × 4 = 160/168
Likewise, for the 2nd fraction, since 8 × 21 = 168,
63/8 = 63 × 21/8 × 21 = 1323/168
Add the two like fractions:
160/168 + 1323/168 = 160 + 1323/168 = 1483/168
So, 40/42 + 63/8 = 1483/168
In mixed form: 8139/168

MathStep (Works offline)

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