MATH/multiply by Pof10, Est, Distrib. Prop, Mult.1 Digit

Vocabulary

100

4 X 3 x 2 = 24

4 X 2 X 3 = 24

3 X 4 X 2 = 24

Name the property

Commutative Property of Multiplication

200

6X(10+8) = (6x10) + (6x8)

Name the property

Distributive Property

300

(4x3)x2=24

4x(3x2)=24

(4x3)x2=4x(3x2)

Name the property

Associative Property of Multiplication

400

               16

              x  2

             ____            This is an example of what

                12             kind of product?

              +20

             ____

Partial Products

500

Rounding is one way to _______ products.

EXAMPLE: 4 x 1, 930 is about 4 x 2,000

Estimate

Multiply by Mult. 10

100

8x20

160

200

7x600

4,200

300

3,000 x 4

12,000

400

4x500

2,000

500

5,000 x 6

30,000

Estimate

100

Estimate:

8 x 89

Sample: 720

200

Estimate:

9 x 62

 Sample:540

300

Estimate:

7 x 486

 Sample:3,500

400

Estimate:

5 x 1,240

Sample:5,000

500

Estimate:

8 x 4,624

Sample: 40,000

Distributive Property

100

39 x 5

(5x30) + (5x9)

195

200

6 x 310

(6x300)+(6x10)

1,860

300

5x108

(5x100)+(5x8)

540

400

7x280

(7x200)+(7x80)

1.960

500

4x1,554

(4x1,000)+(4X500)+(4x50)+(4x4)

6,216

Multiply

100

83 x 5

415

200

245 x 3

735

300

2,319 x 5

11,595

400

4 x 4,347

17,388

500

7 x 1,287

9,009