Add 40/80 and 70/7
1st number: 40/80, 2nd number: 10 0/7
40/80 + 70/7 is 21/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 7 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 7 × 80 = 560,
70/7 = 70 × 80/7 × 80 = 5600/560 - Add the two like fractions:
280/560 + 5600/560 = 280 + 5600/560 = 5880/560 - 5880/560 simplified gives 21/2
- So, 40/80 + 70/7 = 21/2
In mixed form: 101/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80+70/14 40/80+70/21 40/80+70/35 40/80+70/49