Add 90/3 and 42/40, Solve 30 0/3 + 1 2/40 as a fraction

Add 90/3 and 42/40

1^st number: 30 0/3, 2^nd number: 1 2/40

90/3 + 42/40 is 621/20.

Find the least common denominator or LCM of the two denominators:
LCM of 3 and 40 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 3 × 40 = 120,
90/3 = 90 × 40/3 × 40 = 3600/120
Likewise, for the 2nd fraction, since 40 × 3 = 120,
42/40 = 42 × 3/40 × 3 = 126/120
Add the two like fractions:
3600/120 + 126/120 = 3600 + 126/120 = 3726/120
3726/120 simplified gives 621/20
So, 90/3 + 42/40 = 621/20
In mixed form: 311/20

MathStep (Works offline)

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