Add 4/21 and 18/30
4/21 + 18/30 is 83/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
4/21 = 4 × 10/21 × 10 = 40/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
18/30 = 18 × 7/30 × 7 = 126/210 - Add the two like fractions:
40/210 + 126/210 = 40 + 126/210 = 166/210 - 166/210 simplified gives 83/105
- So, 4/21 + 18/30 = 83/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+18/30 4/21+36/30 4/42+18/30 4/21+18/60 12/21+18/30 4/21+54/30 4/63+18/30 4/21+18/90 20/21+18/30 4/21+90/30 28/21+18/30