Envisions Topic 4

Multiply by Power of 10

100

5.02 x 10³

What is 5020?

200

63.7 x 10⁴

What is 637,000?

300

94.6 x 10³

94600

400

6.817 x 10⁵

What is 681,700?

500

563.7 x 10²

56370

Whole Numbers x Decimal

100

1.2 x 5

6

200

63 x 0.5

31.5

300

6.5 x 8

52

400

6.2 x 10

62

500

4.5 x 11

49.5

Estimation

100

15.8 x 21.32

15 X 20 = 300

200

12.12 x 14.09

10 X 14 = 140

300

23.8 x 19.87

25 X 20 = 400

400

31.6 x 20.54

30 X 20 = 600

500

62.89 x 42.7

60 X 40 = 2,400

Decimal x Decimal

100

3.4 x 5.6 = 

What is 19.04?

200

8.9 x 4.7= 

What is 41.83?

300

14.25 x 6.7=

What is 95.475?

400

78.36 x 5.3= 

What is 415.308?

500

1.03 x 4.2= 

What is 4.326?

Vocabulary

100

The answer to a multiplication problem. 

What is a product?

200

The property that REGROUPS factors, but doesn't change the outcome of the problem.  Hint it uses parenthesis

What is the Associative Property?

300

The Property that "flip-flops" the factors, but doesn't change the outcome. 

What is the Commutative Property?

400

Numbers that are multiplied together to get a product. 

What are factors?

500

Numbers which are easy to compute mentally because they are closely related to one another. 

What are compatible numbers?