explain 2 ways to evaluate 15(90-3)
distribute the 15 first or subtract inside the parentheses first and then multiply
First Way:
15(90-3)
=15(109-3)
=15109-153
=1509-45
=1,350-45
=1,305
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Second Way:
15(90-3)
=15(87)
=15(80+7)
=15(108+7)
=15108+157
=1508+(10+5)*7
=1,200+70+35
=1,200+105
=1,305