Add 28/70 and 40/80
28/70 + 40/80 is 9/10.
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,
28/70 = 28 × 8/70 × 8 = 224/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
40/80 = 40 × 7/80 × 7 = 280/560 - Add the two like fractions:
224/560 + 280/560 = 224 + 280/560 = 504/560 - 504/560 simplified gives 9/10
- So, 28/70 + 40/80 = 9/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/70+40/80 84/70+40/80