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oC
60
50
40
30
20
10
0
-10
-20
-30
Read the temperature on the
thermometer as it changes.
Thermometer
oC
60
50
40
30
20
10
0
-10
-20
-30
Read the temperature on the
thermometer as it changes.
200C
oC
60
50
40
30
20
10
0
-10
-20
-30
Read the temperature on the
thermometer as it changes.
500C
oC
60
50
40
30
20
10
0
-10
-20
-30
Read the temperature on the
thermometer as it changes.
250C
oC
60
50
40
30
20
10
0
-10
-20
-30
Read the temperature on the
thermometer as it changes.
00C
oC
60
50
40
30
20
10
0
-10
-20
-30
Read the temperature on the
thermometer as it changes.
-100C
oC
60
50
40
30
20
10
0
-10
-20
-30
Read the temperature on the
thermometer as it changes.
-50C
oC
60
50
40
30
20
10
0
-10
-20
-30
Read the temperature on the
thermometer as it changes.
-200C
oC
60
50
40
30
20
10
0
-10
-20
-30
Read the temperature on the
thermometer as it changes.
-150C
oC
60
50
40
30
20
10
0
-10
-20
-30
Read the temperature on the
thermometer as it changes.
-250C
oC
What is the difference
in temperature between
the two thermometers?
Difference
oC
60
60
50
50
40
30
40
30
20
20
10
10
0
0
-10
-10
-20
-30
-20
-30
40 degrees
oC
What is the difference
in temperature between
the two thermometers?
oC
60
60
50
50
40
30
40
30
20
20
10
10
0
0
-10
-10
-20
-30
-20
-30
15 degrees
oC
What is the difference
in temperature between
the two thermometers?
oC
60
60
50
50
40
30
40
30
20
20
10
10
0
0
-10
-10
-20
-30
-20
-30
30 degrees
oC
What is the difference
in temperature between
the two thermometers?
oC
60
60
50
50
40
30
40
30
20
20
10
10
0
0
-10
-10
-20
-30
-20
-30
30 degrees
oC
What is the difference
in temperature between
the two thermometers?
oC
60
60
50
50
40
30
40
30
20
20
10
10
0
0
-10
-10
-20
-30
-20
-30
65 degrees
oC
What is the difference
in temperature between
the two thermometers?
oC
60
60
50
50
40
30
40
30
20
20
10
10
0
0
-10
-10
-20
-30
-20
-30
10 degrees
oC
What is the difference
in temperature between
the two thermometers?
oC
60
60
50
50
40
30
40
30
20
20
10
10
0
0
-10
-10
-20
-30
-20
-30
20 degrees
oC
What is the difference
in temperature between
the two thermometers?
oC
60
60
50
50
40
30
40
30
20
20
10
10
0
0
-10
-10
-20
-30
-20
-30
15 degrees
oC
What is the difference
in temperature between
the two thermometers?
oC
60
60
50
50
40
30
40
30
20
20
10
10
0
0
-10
-10
-20
-30
-20
-30
10 degrees
oC
What is the difference
in temperature between
the two thermometers?
oC
60
60
50
50
40
30
40
30
20
20
10
10
0
0
-10
-10
-20
-30
-20
-30
20 degrees
oC
What is the difference
in temperature between
the two thermometers?
oC
60
60
50
50
40
30
40
30
20
20
10
10
0
0
-10
-10
-20
-30
-20
-30
70 degrees
30m
30 m
25 m
Sea level
15m
20 m
Estimate the height above or below sea level of
the following points:
6m
5m
20m
10m
0m
-5 m
-10m
-10m
-15 m
-20m
-25 m
-30 m
-25 m
-30m
50m
57m
50m
60m
40m
40m
Estimate the height above or below sea level of
the following points:
15m
20m
0m
-5m
-10m
-10m
-20m
- 25m
-30m
-40m
- 40m
- 60m
-60m
30 m
25 m
20 m
60m
10m
21m
50m
20m
30m
15m
0m
15m
Calculate
The dolphin
helicopter
the
difference
and
the
lighthouse:
anchor.
in
height
between the following:
hot air
boat
flock
lobster
jelly
fish
and
ofballoon
and
and
birds
the
and
the
the
fish.
the
and
and
seal:
jelly
anchor.
sea
the
the
fish.
horse.
sea
lobster:
horse.
6m
5m
-5 m
-10m
-15 m
-25 m
-30 m
-25 m
50m
57m
50m
55m
5m
60m
35m
30m
117m
17m
40m
10m
80m
40m
Calculate
pearl
the
and
difference
the
submarine.
aeroplane:
in height
between the following:
The
seagull
turtle
hot
diver
hang
kiteair
and
glider
and
and
and
balloon
the
the
the
the
and
seagull:
diver:
octopus.
sextant.
submarine.
and
nautilus.
thethe
sextant.
pearl.
octopus.
15m
-5m
-10m
-10m
- 25m
-30m
- 40m
- 60m
Negative Numbers on the Number Line
Negative numbers are useful for representing quantities that can
have values below zero. Examples include temperature, debt and
heights below sea level. The part of the number line that consists of
the positive and negative whole numbers, together with zero, are
called the integers.
Number Line
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
0
1
2
3
4
5
6
7
8
9 10
To add numbers on a number line simply count to the right.
To subtract numbers on a number line simply count to the left.
ADD +
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
0
Subtract -
1
2
3
4
5
6
7
8
9 10
Negative Numbers on the Number Line
2+5=
7
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
0+6=
2
3
6
5
4
9 10
8
7
0
1
2
3
4
5
6
7
8
9 10
0
1
2
3
4
5
6
7
8
9 10
0
1
2
3
4
5
6
7
8
9 10
0
1
2
3
4
5
6
7
8
9 10
0
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
-4+7=
1
4
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
-5 + 5 =
0
6
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
-3 + 7 =
Adding +
3
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
Negative Numbers on the Number Line
Adding +
You may use the number line if you wish, to answer the following:
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
0
1
2
3
4
5
6
7
8
9 10
1
-1+3=
2
6
-8+8=
0
2
-4+5=
1
7
-9+6=
-3
3
-6+9=
3
8
-5+4=
-1
4
- 7 + 12 =
5
9
- 10 + 20 =
10
5
- 6 + 10 =
4
10
- 15 + 8 =
-7
Negative Numbers on the Number Line
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
2
7-5=
Subtracting 0
1
2
3
6
5
4
9 10
8
7
6-6=
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
0
1
2
3
4
6
5
7
0
8
4-7=
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
0
1
2
3
4
5
6
7
-3
8
0-5=
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
9 10
-5
8
-2–7=
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
9 10
9 10
-9
8
9 10
Negative Numbers on the Number Line
Subtracting You may use the number line if you wish, to answer the following:
-10 -9 -8 -7 -6 -5 -4 -3 -2 -1
0
1
2
3
4
5
6
7
8
9 10
1
7-3=
4
6
-1-1=
-2
2
4-4=
0
7
-2-3=
-5
3
3-5=
-2
8
-5-3=
-8
4
1-8=
-7
9
-7-3=
-10
5
0-6=
-6
10
- 3 - 12 =
-15
m
m
m
Blank Scale 1 m
m
m
Estimate the height above or below sea level of
the following points:
m
m
m
0m
m
m
m
m
m
m
m
m
m
m
m
Blank Scale 2
m
m
m
m
Estimate the height above or below sea level of
the following points:
m
m
0m
m
m
m
m
m
m
m
m
m
m
m
m
Blank difference 1m
m
m
m
m
m
m
m
m
m
m
m
m
Blank difference 2
m
m
m
m
m
m
m
m
m
oC
oC
oC
60
60
60
50
50
40
30
40
30
20
20
Blan
50
40k
30
Ther
20
10
mo
0
-10
met
-20
-30
er
10
10
0
0
-10
-10
-20
-30
-20
-30