Add 20/70 and 9/40
20/70 + 9/40 is 143/280.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
20/70 = 20 × 4/70 × 4 = 80/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
9/40 = 9 × 7/40 × 7 = 63/280 - Add the two like fractions:
80/280 + 63/280 = 80 + 63/280 = 143/280 - So, 20/70 + 9/40 = 143/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/70+9/40 20/70+18/40 20/70+9/80 60/70+9/40 20/70+27/40 20/70+45/40 20/70+63/40