Add 30/80 and 40/25
1st number: 30/80, 2nd number: 1 15/25
30/80 + 40/25 is 79/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 25 is 400
Next, find the equivalent fraction of both fractional numbers with denominator 400 - For the 1st fraction, since 80 × 5 = 400,
30/80 = 30 × 5/80 × 5 = 150/400 - Likewise, for the 2nd fraction, since 25 × 16 = 400,
40/25 = 40 × 16/25 × 16 = 640/400 - Add the two like fractions:
150/400 + 640/400 = 150 + 640/400 = 790/400 - 790/400 simplified gives 79/40
- So, 30/80 + 40/25 = 79/40
In mixed form: 139/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80+40/25 30/80+80/25 30/80+40/50 90/80+40/25 30/80+40/75