Add 4/40 and 42/30, Solve 4/40 + 1 12/30 as a fraction

Add 4/40 and 42/30

1^st number: 4/40, 2^nd number: 1 12/30

4/40 + 42/30 is 3/2.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 30 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 40 × 3 = 120,
4/40 = 4 × 3/40 × 3 = 12/120
Likewise, for the 2nd fraction, since 30 × 4 = 120,
42/30 = 42 × 4/30 × 4 = 168/120
Add the two like fractions:
12/120 + 168/120 = 12 + 168/120 = 180/120
180/120 simplified gives 3/2
So, 4/40 + 42/30 = 3/2
In mixed form: 11/2

MathStep (Works offline)

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