Add 40/70 and 21/80
40/70 + 21/80 is 467/560.
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,
40/70 = 40 × 8/70 × 8 = 320/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
21/80 = 21 × 7/80 × 7 = 147/560 - Add the two like fractions:
320/560 + 147/560 = 320 + 147/560 = 467/560 - So, 40/70 + 21/80 = 467/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/70+21/80 40/70+42/80 40/70+63/80