Answers

Add 4/21 and 7/90

4/21 + 7/90 is 169/630.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 90 is 630
   
   Next, find the equivalent fraction of both fractional numbers with denominator 630
2. For the 1st fraction, since 21 × 30 = 630,
   4/21 = 4 × 30/21 × 30 = 120/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   7/90 = 7 × 7/90 × 7 = 49/630
4. Add the two like fractions:
   120/630 + 49/630 = 120 + 49/630 = 169/630
5. So, 4/21 + 7/90 = 169/630

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