Answers

Add 21/90 and 72/10

1^st number: 21/90, 2^nd number: 7 2/10

21/90 + 72/10 is 223/30.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 90 and 10 is 90
   
   Next, find the equivalent fraction of both fractional numbers with denominator 90
2. For the 1st fraction, since 90 × 1 = 90,
   21/90 = 21 × 1/90 × 1 = 21/90
3. Likewise, for the 2nd fraction, since 10 × 9 = 90,
   72/10 = 72 × 9/10 × 9 = 648/90
4. Add the two like fractions:
   21/90 + 648/90 = 21 + 648/90 = 669/90
5. 669/90 simplified gives 223/30
6. So, 21/90 + 72/10 = 223/30
   In mixed form: 713/30

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