Add 10/20 and 8/42
10/20 + 8/42 is 29/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
10/20 = 10 × 21/20 × 21 = 210/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
8/42 = 8 × 10/42 × 10 = 80/420 - Add the two like fractions:
210/420 + 80/420 = 210 + 80/420 = 290/420 - 290/420 simplified gives 29/42
- So, 10/20 + 8/42 = 29/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20+16/42 10/40+8/42 10/20+8/84 30/20+8/42 10/20+24/42 10/60+8/42 50/20+8/42 10/20+40/42 70/20+8/42 10/20+56/42