Download unit 2 extra practice answers

Name
Master 2.23a
Date
Extra Practice Sample Answers
Extra Practice 1 – Master 2.18
Lesson 2.1
1. a) –12
b) Adding a number 4 times is the same as 4 times
the number.
2. a) +12
4. (+5) × (–2) = –10; the ice melted 10 cm after 5 days.
5. a) (+2) × (–30) = –60; Aliya is 60 cm below her
previous elevation.
b) (–3) × (–30) = 90; Aliya was 90 cm above her
current elevation.
Extra Practice 2 – Master 2.19
Lesson 2.2
b) –42
c) –15
d) +24
1. a) +4; 0; –4; –8;
(+4) × (–3) = –12
(+4) × (–4) = –16
(+4) × (–5) = –20
b) +5; 0; –5; –10;
(–3) × (+5) = –15
(–4) × (+5) = –20
(–5) × (+5) = –25
2. a) The product of two integers is positive when the
integers have the same sign.
b) The product of two integers is negative when the
integers have opposite signs.
3. a) –18
b) +12
c) –14
d) –12
e) –1
f) +25
4. a) +330
b) –860
c) +918
d) –682
e) –1206
f) 1612
5. a) +3 and +6; the greatest product will be a product
of two numbers with the same sign and largest
size. So, it will be (+3) × (+6) = +18 or (–2) × (–
8) = +16.
b) +6 and –8; the least product will be a product of
two numbers with opposite signs and largest size.
So, it will be (+6) × (–8) = –48.
3. a) +16
b) –12
c) –36
d) +18
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Name
Master 2.23b
Date
Extra Practice Sample Answers continued
Extra Practice 3 – Master 2.20
Lesson 2.3
1. a) +5
b) –3
c) –8
d) +5
2. a) The quotient of two integers is positive when the
integers have the same sign.
b) The quotient of two integers is negative when the
integers have opposite signs.
3. a) +10
b) –8
c) –8
d) +7
e) 0
f) +1
4. a) –5
b) +3
c) –3
d) 0
e) +1
f) –4
–5, –4, –3, 0, +1, +3
5. –2°C
Extra Practice 5 – Master 2.22
Lesson 2.5
2. a) +9
b) –4
c) –1
d) +3
3. 6 m
4. The stock drops an average of 6 points per day.
Extra Practice 4 – Master 2.21
Lesson 2.4
1. a) –8
+4
–15
–3
+6
–2
+18
+3
b) The rules are similar. The sign of the product of
two integers with the same sign is positive and
the sign of the quotient
of two integers with the same sign is positive.
The sign of the product of two integers with
opposite signs is negative and the sign of the
quotient of two integers with opposite signs is
negative.
1. a)
b)
c)
d)
2. a)
36; Multiplication
–20; Addition inside brackets
–2; Subtraction inside brackets
4; Division
4(–8) – 9
= –32 – 9
= –41
b) (–1) + (–20) ÷ 5
= (–1) + (–4)
= –5
c) (–9) + (–4)(–2)
= (–9) + 8
= –1
d) (–3)[(–8) – 11]
= (–3)(–19)
= 57
3. a) –7
b) –2
c) 1
d) –6
4. a) –20
b) –1
c) 3
d) –8
5. a) –11; 12 ÷ [(–4) + (–8)]
b) –7; [(–9) + 6] ÷ 3
c) 1; 5 ÷ (–5) × [0 + 1]
The right to reproduce or modify this page is restricted to purchasing schools.
This page may have been modified from its original. Copyright © 2008 Pearson Education Canada