Ordering Integers
Oder the integers -20, -200, 65 and 2 from greatest to least.
65, 2, -20, -200
(-526) + (-24)
-550
Subtract
(-2) - (-5) =
3
The temperature was –3º C last night. It is now –4º C. What was the change in temperature?
-1
What is an integer?
A whole number that is not a fraction. It can be positive, negative, or zero.
True or false? Is it warmer in Toronto during the winter than Vancouver?
Toronto Winter Temperature (-30)
Vancouver Winter Temperature (-10)
Toronto
(-20) + (-25) + (20) + (25)
0
25 - (-27) - 19 - (-2) =
35
The lowest temperature possible is approximately
–273°C. The temperature at which water boils is 100°C. What is the difference in these temperatures?
100 - (-273) = 373
If you subtract a negative integer from a positive integer, the answer is usually...?
Positive or Negative?
eg. 23 - (-55) =
Positive
Which integer is greater?
2 + (-5) or (-5) + (5)
(-5) + (5)
Extend the pattern 3 more integers.
-5, -2, +1,
4, 7, 10
What integer subtraction problem will give you an answer of -8
(-10) - (-2) = -8
At midnight in North Bay, the temperature was -5°C. During the next 24 h, the temperature rose 12°C, then dropped 9°C. What was the final temperature?
(-5) + 12 = 7
7 - 9 = -2 degrees Celsius
Integers are primarily used to measure...?
Temperature
The coldest temperatures in our provinces and territories are recorded below. Order the temperatures from coldest to warmest.
Alberta
-61
Manitoba
-53
Nova Scotia
-47
Nunavut
-64
Ontario
-58
Quebec
-54
-64, -61, -58, -54, -53, -57
(-5) + ___ = -3
2
Solve
3 - ____ = -1
4
One day, the temperature in Wabash Lake, Newfoundland, was -41˚C; in Pelly Bay, Nunavut, it was -51˚C. The temperature in Churchill, Manitoba, was halfway between these temperatures. What was the temperature in Churchill?
-46˚C
Explain the zero strategy and how it works with integers.
A positive integer and its opposite added together equals zero.
-3 is halfway between two integers on a number line. What are the 2 integers?
-5 , -1
-6, 0
-4, -2
Complete the magic square
3 ____ 1
___ 0 ____
-1 ___ ____
-2, 2, -3, 4, -4
Find the difference between a temperature of 49 degrees and -65 degrees.
49 - (-65) = 114 degrees
During one week, the stock market did the following: Monday rose 18 points, Tuesday rose 31 points, Wednesday dropped 500 points, Thursday rose 27 points and Friday dropped 1000 points. If it started out at 1,196 on Monday, what did it end up on Friday?
-228
How many positive and negative counters will need to be added to solve this equation?
(24) - (-36) =
36 negatives and 36 positives or 72 counters