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math

posted by on .

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

  • math - ,

    (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

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