Add 21/42 and 1/10
21/42 + 1/10 is 3/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
21/42 = 21 × 5/42 × 5 = 105/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
1/10 = 1 × 21/10 × 21 = 21/210 - Add the two like fractions:
105/210 + 21/210 = 105 + 21/210 = 126/210 - 126/210 simplified gives 3/5
- So, 21/42 + 1/10 = 3/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42+2/10 21/84+1/10 21/42+1/20 63/42+1/10 21/42+3/10 21/42+1/30 21/42+5/10 21/42+1/50 21/42+7/10 21/42+1/70