Add 27/90 and 10/21
27/90 + 10/21 is 163/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
27/90 = 27 × 7/90 × 7 = 189/630 - Likewise, for the 2nd fraction, since 21 × 30 = 630,
10/21 = 10 × 30/21 × 30 = 300/630 - Add the two like fractions:
189/630 + 300/630 = 189 + 300/630 = 489/630 - 489/630 simplified gives 163/210
- So, 27/90 + 10/21 = 163/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/90+10/21 27/90+20/21 27/90+10/42 81/90+10/21 27/90+30/21 27/90+10/63 27/90+50/21 27/90+70/21