UPSKILL MATH PLUS

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Choose the suitable property of the whole number that applies to the following conditions:
 
1. 9+1=9+1.
 
2. 22×1=22 .
 
3. 2 + (1 + 9) = (2 + 1) + 9 .
 
4. 9×(2+13)=(9×2)+(13×9) .