Add 10/40 and 28/70
10/40 + 28/70 is 13/20.
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,
10/40 = 10 × 7/40 × 7 = 70/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
28/70 = 28 × 4/70 × 4 = 112/280 - Add the two like fractions:
70/280 + 112/280 = 70 + 112/280 = 182/280 - 182/280 simplified gives 13/20
- So, 10/40 + 28/70 = 13/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40+28/70 10/40+56/70 10/80+28/70 30/40+28/70 10/40+84/70 50/40+28/70 70/40+28/70