the number line 0123456789-9-8-7-6-5-4-3-2 zero – neither (+) or (-) negative numberspositive...
TRANSCRIPT
THE NUMBER LINE
0 1 2 3 4 5 6 7 8 9-9 -8 -7 -6 -5 -4 -3 -2 -1
zero – neither (+) or (-)
negative numbers positive numbers
a) Name the integer that describes each situation
- A gain in weight of 7 pounds
- 10 degrees below zero
+ 7
- 10
b) Name the coordinates of the points graphed.
0 1 2 3 4 5 6 7 8 9-9 -8 -7 -6 -5 -4 -3 -2 -1
C AT
-7 0 4
c) Insert the appropriate inequality symbol to make each statement true.
0 1 2 3 4 5 6 7 8 9-9 -8 -7 -6 -5 -4 -3 -2 -1
-5 2 -3 -1 4 -6 <
<
>
? ? ?
Have you ever played rummy?
Have you ever played solitaire on the computer?
- 4 + - 9 = - 13
+
+
“Neutral Pairs”
+ + + +
-3 + 4 = 1
–8 10 =
Change
(sign)-Keep
Change
(operation)
+
+ + + + + + + +
- 2Use “keep-change-change” ~ only to change subtraction to addition.
- 9 ( 4) + 2 =– -+
Keep
Change
(operation)
Change
(sign)
+
+ + + +
- 3
+ +
“Hey, have you ever heard of a double negative in English class?”
A football team made the following yardage on five plays: lost 4, gained 16, gained 9, lost 8, and lost 4. What was the net yardage on the 5 plays?
- 4 + 16 + 9 – 8 – 4 = - 4 + 16 + 9 + - 8 + - 4
If you like “keep change change”
= 12 + 9 + - 8 + - 4 = 21 + - 8 + - 4 = 13 + - 4 = + 9
Click here for visual tiles
What are all of the rules?!
(+)(+) = (+)(+)(-) = (-)(-)(+) = (-)(-)(-) = (+)
12 4(3) = means “4 groups of 3”
+ +
+
+ +
+
+ +
+
+ +
+Group 1 Group 2 Group 3 Group 4
5(-4) =
Group 1 Group 2 Group 3
Group 4 Group 5
-20 means “5 groups of -4”
Why is a negative # times a negative # equal to a positive #?
3(-4) = -12
2(-4) = - 8
1(-4) = - 4
0(-4) = 0
-1(-4) =
4
3(4) = 12
2(4) = 8
1(4) = 4
0(4) = 0
-1(4) =
-4
-2(4) = -8 -2(-4) = 8
? ?
A diver descended a total of 60 feet in 5 equal segments. What integer describes each of his descents?
- 60
He “descended.”
i.e. below sea level
÷ 5 = -12Describe what this integer means
WORKSHEET: # 1 – 30
- 4 + 16 + 9 – 8 – 4 = - 4 + 16 + 9 + - 8 + - 4
+ + + + + + + + +
+ + + + + + +
+ + + + + + + + +
Back to Slide Show
= 9