Add 42/21 and 20/10
1st number: 2 0/21, 2nd number: 2 0/10
42/21 + 20/10 is 4/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
42/21 = 42 × 10/21 × 10 = 420/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
20/10 = 20 × 21/10 × 21 = 420/210 - Add the two like fractions:
420/210 + 420/210 = 420 + 420/210 = 840/210 - 840/210 simplified gives 4/1
- So, 42/21 + 20/10 = 4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21+20/10 42/21+40/10 42/21+60/10 42/63+20/10 42/21+20/30 42/21+20/50 42/21+20/70