Explain 2 ways to evaluate 15(90-3)
2 answers:
Distribute the 15 first or subtract inside the parentheses first and then multiply
First Way:
15(90-3)
=15(10*9-3)
=15*10*9-15*3
=150*9-45
=1,350-45
=1,305
-----------------
Second Way:
15(90-3)
=15(87)
=15(80+7)
=15(10*8+7)
=15*10*8+15*7
=150*8+(10+5)*7
=1,200+70+35
=1,200+105
=1,305
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