Vocabulary
What do we call positive or negative numbers?
Integers
-5 + 9
4
-4 - 6
-4 + (-6) = -10
-2 - 3
-2 + (-3) = -5
Jason dives 10 feet underwater and swims back up 3 feet. Where is his current location in the water?
-10 + 3= -7
Numbers greater than zero.
Positive Integers
-12 + 5
-7
4 - 11
4 + (-11) = -7
-10 + 30
20
Chris gets paid $100 and then must pay his cable bill which is $245. How much money does he have?
$100 - $245 = $-145
Numbers less than zero.
Negative Integers
-16 + (-17)
-33
15 - (-7)
15 + 7 = 22
21 - (+5)
21 + (-5) = 16
The temperature outside was 20 degrees below zero, it rose 12 degrees in the afternoon. What temperature is it now?
-20 + 8 = -12
+10 and -10 are an example of this.
Opposites
36 + (-42)
-6
-27 - (-3)
-27 + 3 = -24
-10 + (-2) - 5
-10 + (-2) = -12
-12 + (-5) = -17
In a game, Farhan earned 15 points in the first round, in the 2nd round he lost 20 points for not showing good sportmanship. In the final round, Farhan scored double what he did in the first round. What is his final score?
15 + (-20) + 30 = 25 points
When you look at how far away a number is, positive or negative, from zero.
Absolute Value
(-16) + 18 + (-17)
-15
-10 - 11 - (-3)
-10 + (-11) + (3)= -18
13 + (-15) - 20
13 + (-15) = -2
-2 + (-20) = -22
Maya starts with $1000 in her bank account, she withdraws $750 to pay her rent. She lets a friend borrow $70, buys new clothes for $120. She finds $100 cash on the street, and deposits 1/4 of it. How much money is in her bank account?
$1000 - $750 - $70 - $120 + $25 = $85