Add 21/40 and 30/48
21/40 + 30/48 is 23/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 48 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 40 × 6 = 240,
21/40 = 21 × 6/40 × 6 = 126/240 - Likewise, for the 2nd fraction, since 48 × 5 = 240,
30/48 = 30 × 5/48 × 5 = 150/240 - Add the two like fractions:
126/240 + 150/240 = 126 + 150/240 = 276/240 - 276/240 simplified gives 23/20
- So, 21/40 + 30/48 = 23/20
In mixed form: 13/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40+30/48 21/40+60/48 21/80+30/48 21/40+30/96 63/40+30/48 21/40+90/48