EMAT 3400 Ch

# EMAT 3400 Ch - exactly Multiplication EMAT 3400 Wednesday...

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EMAT 3400  Ch. 5-7 of Classroom Discussions Wed. 12:36 1. What is a problem? Problem v. Exercise. Genuine problem doesn’t have  clear-cut formula to follow. deductive reasoning        (p.79) Similar to process of elimination. Basically, a  process of taking a whole bunch of little information and using that info to  reach the big conclusion. Solve and compose multiple answers   talk about how strategies are alike  and different. IMPORTANT: Give strategies names (guess/check, make a  list/chart, draw a picture,…etc.) “What strategy do we use to solve this  problem”   helps students see which problems match each strategy.  2. What is the role of definitions? Aren’t right or wrong…they just  are . Someone  composed definitions and we just follow along. i.e. a trapezoid could be a square  b/c they both have 4 sides, UNLESS, the definition says a trapezoid is

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Unformatted text preview: exactly: Multiplication EMAT 3400 Wednesday, October 20, 2010 27x3- Repeated Addition 27+27+27=81- Array(geometrically) 3 x (20+7)= 3x20= 60 & 3x7=21 60+21=81- Expanded - Traditional 37x24-Repeated Addition not necessary in this problem-Array 30 + 7 20 600 140 4 120 28 600+140+120+28= 888 32x45 30 + 2 40 + 1200 80 5 150 10 1200+80+150+10= 1,440 Expanded 45x32= (5x2)+(40x2)+(30x5)+(30x40)= 10+80+150+1200= 1,440 Same as: (40+5)(30+2) Foiling, like in High School Place-Value • 3x5= 3 groups of 5 15 • 3x50= 3 groups of five 10’s 150 • 3x500= 3 groups of five 100’s 1,500 could do: (3x5)x100= 15x100= 1,500 30x40 3x4= 12 + 10x10= 100 1,200 12:36 12:36...
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EMAT 3400 Ch - exactly Multiplication EMAT 3400 Wednesday...

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