Add 3/40 and 28/70
3/40 + 28/70 is 19/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 70 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
3/40 = 3 × 7/40 × 7 = 21/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
28/70 = 28 × 4/70 × 4 = 112/280 - Add the two like fractions:
21/280 + 112/280 = 21 + 112/280 = 133/280 - 133/280 simplified gives 19/40
- So, 3/40 + 28/70 = 19/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/40+28/70 3/40+56/70 3/80+28/70 9/40+28/70 3/40+84/70 15/40+28/70 21/40+28/70