Add 28/40 and 2/7
28/40 + 2/7 is 69/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 7 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
28/40 = 28 × 7/40 × 7 = 196/280 - Likewise, for the 2nd fraction, since 7 × 40 = 280,
2/7 = 2 × 40/7 × 40 = 80/280 - Add the two like fractions:
196/280 + 80/280 = 196 + 80/280 = 276/280 - 276/280 simplified gives 69/70
- So, 28/40 + 2/7 = 69/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/40+2/7 28/40+4/7 28/80+2/7 28/40+2/14 84/40+2/7 28/40+6/7 28/40+2/21 28/40+10/7 28/40+2/35 28/40+14/7 28/40+2/49