Lesson 9.1: Adding Integers
1.
Add. Sketch coloured tiles to show how you did it.
a) (+3) + (+5)
b) (+4) + (4)
c) (5) + (+9)
2.
d) (5) + (3)
Add. Sketch number lines to show how you did it.
a) (+4) + (6)
b) (7) + (+10)
c) (3) + (+3)
d) (3) + (4) + (+5)
3.
a) Show three ways that 6 can be written as the sum of two integers.
b) Show three ways that +2 can be written as the sum of a positive integer and a negative
integer.
4.
Which expressions have the same sum? What is this sum?
a) (6)  (2)
b) (3)  (6)
5.
6.
c) (8)  ( 8)
d) (8)  ( 4)
e) (9)  (4)
f) (3)  (7)
g) (12)  (10)  (2)
h) (10)  (2)  (6)
Add.
a) (3)  (15)
b) (2)  (3)  (9)
c) (98)  (48)
d) (10)  (9)  (1)
A submarine descends 42 m below the surface of the ocean. During the day, its changes in
depth in metres are: +5, 10, 16, +8, 12. Write an integer that represents the submarine’s
depth at the end of the day.
Name
Master 9.25
Date
Extra Practice 2
Lesson 9.2: Subtracting Integers
1.
2.
3.
4.
5.
Rewrite using addition, then evaluate.
a) (5)  (3)
b) (8)  (5)
c) (4)  (4)
d) (13)  (6)
e) (35)  (17)
f) (71)  (71)
Complete each pattern. Extend the pattern for three more rows. Tell how you did it.
a) (+2) – (+3) =
b) (–2) – (+3) =
(+2) – (+2) =
(–2) – (+2) =
(+2) – (+1) =
(–2) – (+1) =
(+2) – (0) =
(–2) – (0) =
(+2) – (–1) =
(–2) – (–1) =
Use a number line to subtract.
a) (+3)  (+2)
b) (9)  (2)
c) (6)  (+3)
d) (4)  (5)
Evaluate.
a) (+4)  (+8)
b) (5)  (9)
c) (9)  (+4)
d) (9)  (10)
e) (+5)  (5)
f) (9)  (9)
At 12:30, the temperature was 7C. At 18:30, the temperature was 13C.
What was the change in temperature?
Name
Master 9.26
Date
Extra Practice 3
Lesson 9.3: Adding and Subtracting Integers
1.
2.
3.
4.
Evaluate.
a) (25)  (36)
b) 25 – 36
c) (8)  (9)
d) 8 – 9
Evaluate.
a)  25  4
b) 16  (8)
c) 18  22
d)  32  (56)
e)  16  (24)
f) 14  (26)
Evaluate.
a) 12  4  8
b)  11  3  8
c)  18  (3)  5
d)  17  11  (6)
Darren and Jill are playing a game. Their total score is 8.
a) Darren’s score is 3. What is Jill’s score?
b) Show two other ways that Jill and Darren could have a total score of 8.