Add 18/30 and 5/21
18/30 + 5/21 is 88/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
18/30 = 18 × 7/30 × 7 = 126/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
5/21 = 5 × 10/21 × 10 = 50/210 - Add the two like fractions:
126/210 + 50/210 = 126 + 50/210 = 176/210 - 176/210 simplified gives 88/105
- So, 18/30 + 5/21 = 88/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/30+5/21 18/30+10/21 18/60+5/21 18/30+5/42 54/30+5/21 18/30+15/21 18/90+5/21 18/30+5/63 90/30+5/21 18/30+25/21 18/30+35/21