Add 40/70 and 15/80
40/70 + 15/80 is 85/112.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 70 × 8 = 560,
40/70 = 40 × 8/70 × 8 = 320/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
15/80 = 15 × 7/80 × 7 = 105/560 - Add the two like fractions:
320/560 + 105/560 = 320 + 105/560 = 425/560 - 425/560 simplified gives 85/112
- So, 40/70 + 15/80 = 85/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/70+15/80 40/70+30/80 40/70+45/80 40/70+75/80