math
posted by stephanie .
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
Respond to this Question
Similar Questions

Math
Use properties of logarithms to find the exact value of this expression. Do not use a calculator. 6log6 8  log6 7 
math
use propertise and mental math to find the value. 19+(28+21) 3 times 270 (86+27)+3 
math
while waiting in the checkout line at the grocery store you add the prices up of your 3 items to make sure you have enough money.explain how to use mental math and the properties of addition to find the total costs of 3 items if the … 
Math  Properties of Logarithms
Use properties of logarithms to find the exact value of the expression. (log3(81)^4 
math
use mental math to find each value 5% rebate on a $150 cell phones 
math
use mental math to find each value cost of 8 items at $12.98 each 
properties and mental math
use properties and mental math to find the value of (86 + 27) + 3 
math
use the properties of logarthms to find the exact value of the each expression lower 7loglower 76 
4th grade Math
What is an expression that can be used to find 4 x 275 using mental math and properties of numbers? 
Algebra
Explain how to use mental math to simplify the expression. a.) 8 * 3 * 2 b.) 8 * 2 + 3 c.) 5 + 8 + 3 d.) 10 * 3 4 I have to include what properties (associative, distributive etc.) I used to simplify the problems.