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Question 414774: Give reasons for the following steps:
123+45 = (1*10^2+2*10+3)+(4*10+5)
= 1*10^2+(2*10+4*10)+(3+5)
= 1*10^2+(2*4)10+(3+5)
= 1*10^2+6*10+8
= 168
This is what I have for an answer, not sure if it's correct:
1.) Place Value
2.) Commutative and Associative properties of addition
3.) Distributive property of multiplication over addition
4.) Single digit addition facts
5.) Place Value
Answer by MathLover1(20850)   (Show Source):
You can put this solution on YOUR website!
your answer is correct....
The Commutative Property (changing the order of the numbers)
and the Associative Property (changing the order of the additions)
so your answer is:
2.) Commutative and Associative properties of addition
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