Answers

Add 20/63 and 28/40

20/63 + 28/40 is 641/630.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 63 and 40 is 2520
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2520
2. For the 1st fraction, since 63 × 40 = 2520,
   20/63 = 20 × 40/63 × 40 = 800/2520
3. Likewise, for the 2nd fraction, since 40 × 63 = 2520,
   28/40 = 28 × 63/40 × 63 = 1764/2520
4. Add the two like fractions:
   800/2520 + 1764/2520 = 800 + 1764/2520 = 2564/2520
5. 2564/2520 simplified gives 641/630
6. So, 20/63 + 28/40 = 641/630
   In mixed form: 111/630

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