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