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Write the missing number. Then,give the property used in each equation
1. 50+90=___+50___
2. 7×(25+5)=(7×25)+(7× ___)____
3. (10+15)+20=10+(__+___) _____
4. (8×___)×9=__×(5×9)____
5. 50+20+15=15+__+50:____.

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1. 90, Commutative Property of Addition

2. 5, Distributive Property

3. 15, 20, Associative Property of Addition

4. 5, 8, Associative Property of Multiplication

5. 20, Associative Property of Addition

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