Add 21/30 and 18/48
21/30 + 18/48 is 43/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 48 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 30 × 8 = 240,
21/30 = 21 × 8/30 × 8 = 168/240 - Likewise, for the 2nd fraction, since 48 × 5 = 240,
18/48 = 18 × 5/48 × 5 = 90/240 - Add the two like fractions:
168/240 + 90/240 = 168 + 90/240 = 258/240 - 258/240 simplified gives 43/40
- So, 21/30 + 18/48 = 43/40
In mixed form: 13/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+18/48 21/30+36/48 21/60+18/48 21/30+18/96 63/30+18/48 21/30+54/48 21/90+18/48 21/30+90/48