Posted by stephanie on .
use properties and mental math to find
the value.
(10times8)times3
8times(3times5)
(36+42)+24

math 
Marie,
(10*8)*3 =10*(8*3) Associative Property
= 10*24
=240
8*(3*5) = 8*(5*3) Commutative Property
=(8*5)*3 Associative Property
=40*3
=120
(36 + 42) + 24 = (42 + 36) + 24 Commutative
= 42 + (36 + 24) Associative
= 42 + 60
= 102