Definitions
A positive or negative whole number, including 0
Integer
(+4) + (+3)
+7
(+8) - (+3)
+5
Tim has $9 and Rob borrows $4 from him. How much money does Tim have?
$5
When the value is greater than 0
positive
(+13) + (+9)
+22
(+15) - (+8)
+7
Two people are standing right beside each other. One walked 9 metres east, the other walks 13 metres west. How far apart are they?
22 metres
When the value is less than 0
negative
(+10) + (-6)
+4
(+11) - (-7)
+18
A monkey climbs 12 metres up a tree and then climbs 5 metres down. How high up the tree is the monkey?
7 metres
A value that is neither positive nor negative
(-12) + (-21)
-33
(-8) - (+9)
-17
A bridge is 23 metres above a river. A tunnel is 8 metres below the river. How far apart are the bridge and tunnel?
31 metres
+1 and -1 make a ________
Zero Pair
(+27) + (-42)
-15
(-19) - (-23)
+4
John got a job and saved $25 per week for 7 weeks. Then his grandma gave him $50 for his birthday. If he spends all his money on cooking lessons that cost $45 each, how many lessons could he buy?
5 lessons