Add 1/21 and 40/42
1/21 + 40/42 is 1/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
1/21 = 1 × 2/21 × 2 = 2/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
40/42 = 40 × 1/42 × 1 = 40/42 - Add the two like fractions:
2/42 + 40/42 = 2 + 40/42 = 42/42 - 42/42 simplified gives 1/1
- So, 1/21 + 40/42 = 1/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+40/42 1/21+80/42 1/42+40/42 1/21+40/84 3/21+40/42 1/63+40/42 5/21+40/42 7/21+40/42