Add 12/40 and 30/35
12/40 + 30/35 is 81/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 35 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
12/40 = 12 × 7/40 × 7 = 84/280 - Likewise, for the 2nd fraction, since 35 × 8 = 280,
30/35 = 30 × 8/35 × 8 = 240/280 - Add the two like fractions:
84/280 + 240/280 = 84 + 240/280 = 324/280 - 324/280 simplified gives 81/70
- So, 12/40 + 30/35 = 81/70
In mixed form: 111/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/40+30/35 12/40+60/35 12/80+30/35 12/40+30/70 36/40+30/35 12/40+90/35 60/40+30/35 84/40+30/35