Add 1/2 and 25/21
1st number: 1/2, 2nd number: 1 4/21
1/2 + 25/21 is 71/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
1/2 = 1 × 21/2 × 21 = 21/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
25/21 = 25 × 2/21 × 2 = 50/42 - Add the two like fractions:
21/42 + 50/42 = 21 + 50/42 = 71/42 - So, 1/2 + 25/21 = 71/42
In mixed form: 129/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 1/2+50/21 1/4+25/21 1/2+25/42 3/2+25/21 1/2+75/21 1/6+25/21 1/2+25/63 5/2+25/21 1/10+25/21 7/2+25/21 1/14+25/21