Add 45/80 and 15/70
45/80 + 15/70 is 87/112.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 70 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 80 × 7 = 560,
45/80 = 45 × 7/80 × 7 = 315/560 - Likewise, for the 2nd fraction, since 70 × 8 = 560,
15/70 = 15 × 8/70 × 8 = 120/560 - Add the two like fractions:
315/560 + 120/560 = 315 + 120/560 = 435/560 - 435/560 simplified gives 87/112
- So, 45/80 + 15/70 = 87/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/80+15/70 45/80+30/70 45/80+45/70 45/80+75/70