Add 40/80 and 5/70
40/80 + 5/70 is 4/7.
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,
40/80 = 40 × 7/80 × 7 = 280/560 - Likewise, for the 2nd fraction, since 70 × 8 = 560,
5/70 = 5 × 8/70 × 8 = 40/560 - Add the two like fractions:
280/560 + 40/560 = 280 + 40/560 = 320/560 - 320/560 simplified gives 4/7
- So, 40/80 + 5/70 = 4/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80+10/70 40/80+15/70 40/80+25/70 40/80+35/70