Add 42/80 and 12/8
1st number: 42/80, 2nd number: 1 4/8
42/80 + 12/8 is 81/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 8 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
42/80 = 42 × 1/80 × 1 = 42/80 - Likewise, for the 2nd fraction, since 8 × 10 = 80,
12/8 = 12 × 10/8 × 10 = 120/80 - Add the two like fractions:
42/80 + 120/80 = 42 + 120/80 = 162/80 - 162/80 simplified gives 81/40
- So, 42/80 + 12/8 = 81/40
In mixed form: 21/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/80+12/8 42/80+24/8 42/80+12/16 42/80+36/8 42/80+12/24 42/80+60/8 42/80+12/40 42/80+84/8 42/80+12/56