November 13, 2012

Shape -> 2-D

Figure -> 3D

Rectangular prism

o Rectangle base --> named after this

o Opposite faces look exactly the same

All squares are rectangle (they have parallel sides)

o But all rectangles are not squares (they don't have equal sides)

Area of 12:

o

3 x 4

4x3

1x12

12x1

6x2

2x6

o Factor x factor = product

Communitive -> 3x4 = 4x3

6 groups of 2 = 2 + 2 + 2+ 2+ 2 + 2

o "groups of" = multiplying

30

o

1 x 30

30 x 1

2 x 15

15 x 2

3 x 10

10 x 3

5 x 6

6 x 5

7

o

1 x 7

7 x 1

Same situation for 13

These are prime numbers

Prime numbers

o To explain -> how many rectangles can you make with 13? 7?

o They can physically see that it only makes one rectangle (without flipping)

Base 10 blocks to represent 15 x 3 -> 15 = 10 + 5 (Junior grades)

o First number -> always length (5 x 2 is 5 length and 2 width)

o 3 10 blocks and 15 individual blocks