Answers

Add 21/70 and 84/54

1^st number: 21/70, 2^nd number: 1 30/54

21/70 + 84/54 is 167/90.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 54 is 1890
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1890
2. For the 1st fraction, since 70 × 27 = 1890,
   21/70 = 21 × 27/70 × 27 = 567/1890
3. Likewise, for the 2nd fraction, since 54 × 35 = 1890,
   84/54 = 84 × 35/54 × 35 = 2940/1890
4. Add the two like fractions:
   567/1890 + 2940/1890 = 567 + 2940/1890 = 3507/1890
5. 3507/1890 simplified gives 167/90
6. So, 21/70 + 84/54 = 167/90
   In mixed form: 177/90

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