Add 40/70 and 20/42
40/70 + 20/42 is 22/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
40/70 = 40 × 3/70 × 3 = 120/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
20/42 = 20 × 5/42 × 5 = 100/210 - Add the two like fractions:
120/210 + 100/210 = 120 + 100/210 = 220/210 - 220/210 simplified gives 22/21
- So, 40/70 + 20/42 = 22/21
In mixed form: 11/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/70+20/42 40/70+40/42 40/70+20/84 40/70+60/42