Answers

Add 25/21 and 56/90

1^st number: 1 4/21, 2^nd number: 56/90

25/21 + 56/90 is 571/315.

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,
   25/21 = 25 × 30/21 × 30 = 750/630
3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
   56/90 = 56 × 7/90 × 7 = 392/630
4. Add the two like fractions:
   750/630 + 392/630 = 750 + 392/630 = 1142/630
5. 1142/630 simplified gives 571/315
6. So, 25/21 + 56/90 = 571/315
   In mixed form: 1256/315

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