intro to multiplying. what you “know” times tables to ________ rules for multiplying integers

Intro to Multiplying

What you “know”

Times tables to ________

Rules for multiplying integers

What we need to understand

There are patterns and tricks that can help us get better at our times tables.

There are reasons that the rules for multiplying integers work out like they do.

MULTIPLICATION saves us the time and trouble of repeated addition.

The first 3 slides are timed problems from our times tables

The faster you answer correctly, the more points you earn.

1. Multiply: 7 x 7

35 42 49 56 81

20% 20% 20%20%20%

Response Grid

A. 35B. 42C. 49D. 56E. 81

Participant Scores0 Participant 10 Participant 20 Participant 30 Participant 40 Participant 50 Participant 60 Participant 7

2. Multiply: 3 x 12

15 30 32 36 42

20% 20% 20%20%20%

Response Grid

A. 15B. 30C. 32D. 36E. 42

Fastest Responders (in seconds)0 Participant 10 Participant 20 Participant 30 Participant 40 Participant 50 Participant 60 Participant 70 Participant 80 Participant 90 Participant 10

Participant Scores0 Participant 10 Participant 20 Participant 30 Participant 40 Participant 50 Participant 60 Participant 7

3. Multiply: 5 x 9

45 50 55 56 72

20% 20% 20%20%20%

Response Grid

A. 45B. 50C. 55D. 56E. 72

Fastest Responders (in seconds)0 Participant 10 Participant 20 Participant 30 Participant 40 Participant 50 Participant 60 Participant 70 Participant 80 Participant 90 Participant 10

Participant Scores0 Participant 10 Participant 20 Participant 30 Participant 40 Participant 50 Participant 60 Participant 7

4. Evaluate: -6 x 4

-24 -2 2 24

25% 25%25%25%

Response Grid

A. -24B. -2C. 2D. 24

5. Evaluate: (-3)x(-7)

-21 -10 10 21

25% 25%25%25%

Response Grid

A. -21B. -10C. 10D. 21

6. Evaluate: 10(-2)

-20 -8 8 20

25% 25%25%25%

Response Grid

A. -20B. -8C. 8D. 20

Participant Scores0 Participant 10 Participant 20 Participant 30 Participant 40 Participant 50 Participant 60 Participant 7

7. Which of the following is NOT a multiple of 4?

124155

136240

452

20% 20% 20%20%20%

Response Grid

A. 124B. 155C. 136D. 240E. 452

Fastest Responders (in seconds)0 Participant 10 Participant 20 Participant 30 Participant 40 Participant 50 Participant 60 Participant 70 Participant 80 Participant 90 Participant 10

What is another way to represent8. 6 + 6 + 6 + 6 + 6 ?

36

6 x 6 x 6 x 6 ... 65

6 x 5

66666

20% 20% 20%20%20%

Response Grid

A. 36B. 6 x 6 x 6 x 6 x 6C. 65

D. 6 x 5 E. 66,666

9. Each person who joins the club pays $25 in dues. If 4 people join, which of the following

gives the total amount of dues?I. 25 + 25 + 25 + 25

II. 25 x 4 III. 25 + 4

I only

II only

III only

I and II,

not ...

I and III

, not..

.

20% 20% 20%20%20%

Response Grid

A. I onlyB. II onlyC. III onlyD. I and II, not IIIE. I and III, not II

Participant Scores0 Participant 10 Participant 20 Participant 30 Participant 40 Participant 50 Participant 60 Participant 7

-3

-3

10. Which of the following represents: – 3 – 3 – 3 – 3 ?

. . . .

25% 25%25%25%

Response Grid

A. .

B. .

C. .

D. .

0-3-6-9-12-15

0-3-6-12-15

129 60

12 9 6 0

-9

3

3

Fastest Responders (in seconds)0 Participant 10 Participant 20 Participant 30 Participant 40 Participant 50 Participant 60 Participant 70 Participant 80 Participant 90 Participant 10