Question

Which two properties can you use to find (3.4 x 4) x (25 x 1) mentally? Explain. Remember that the parentheses tell you which factors to multiply first.

Answer 1

Answer: identity property and associative property

Explanation:

Given expression:
`(3.4* 4)* (25* 1)`

We can solve this product mentally by the two properties,.

At first, solve the second bracket by identity then the product becomes

`(3.4* 4)* (25)`

Then apply associative property , we get

`(3.4* 4)* (25)=(3.4)*(4*25)`

`=3.4*(100)=3.4*100=340`