Add 9/40 and 42/80
9/40 + 42/80 is 3/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 40 × 2 = 80,
9/40 = 9 × 2/40 × 2 = 18/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
42/80 = 42 × 1/80 × 1 = 42/80 - Add the two like fractions:
18/80 + 42/80 = 18 + 42/80 = 60/80 - 60/80 simplified gives 3/4
- So, 9/40 + 42/80 = 3/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/40+42/80 9/40+84/80 9/80+42/80 27/40+42/80 45/40+42/80 63/40+42/80