Add 15/70 and 45/80
15/70 + 45/80 is 87/112.
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,
15/70 = 15 × 8/70 × 8 = 120/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
45/80 = 45 × 7/80 × 7 = 315/560 - Add the two like fractions:
120/560 + 315/560 = 120 + 315/560 = 435/560 - 435/560 simplified gives 87/112
- So, 15/70 + 45/80 = 87/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/70+45/80 15/70+90/80 45/70+45/80 75/70+45/80