Add 21/2 and 30/40
1st number: 10 1/2, 2nd number: 30/40
21/2 + 30/40 is 45/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 2 × 20 = 40,
21/2 = 21 × 20/2 × 20 = 420/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
30/40 = 30 × 1/40 × 1 = 30/40 - Add the two like fractions:
420/40 + 30/40 = 420 + 30/40 = 450/40 - 450/40 simplified gives 45/4
- So, 21/2 + 30/40 = 45/4
In mixed form: 111/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+30/40 21/2+60/40 21/4+30/40 21/2+30/80 63/2+30/40 21/2+90/40 21/6+30/40 21/10+30/40 21/14+30/40