Add 15/40 and 40/70
15/40 + 40/70 is 53/56.
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,
15/40 = 15 × 7/40 × 7 = 105/280 - Likewise, for the 2nd fraction, since 70 × 4 = 280,
40/70 = 40 × 4/70 × 4 = 160/280 - Add the two like fractions:
105/280 + 160/280 = 105 + 160/280 = 265/280 - 265/280 simplified gives 53/56
- So, 15/40 + 40/70 = 53/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/40+40/70 15/40+80/70 15/80+40/70 45/40+40/70 75/40+40/70