Page 37 - Math Smart - 7

CHAPTER
In this chapter

Pupils should be able to:
Integers • recognise negative
numbers as positions
Integers include all positive whole numbers, negative whole numbers and 0. on a number line
• order positive and
We use numbers to record temperature. Look at the temperatures on the
thermometer. 0°C is the temperature at which pure water freezes. 57°C is negative integers
one of the highest air temperatures recorded on Earth. The number 57 is a • add and subtract
positive number. It is also an Integer. positive and negative
integers
We sometimes need to use numbers that are smaller than 0. For example,
-68°C is one of the lowest air temperatures recorded on Earth. All numbers
that are smaller than 0 are negative numbers. The number -68 is a negative
number. It is also an integer.

c
57°C: one of =- 70
•• Think and Share the highest air |- 60
temperatures -
recorded on |- 50
Dion wants to change the air temperature in a room. The table Earth |_ 40
below shows the air temperature before the change and the
temperature change he desires. * 1- 30
O What is the temperature in the room after the change? I- 20
Complete the table. Dion has done one example. 0®C: freezing |- 10
' >iuro
[■•III point of fresh I- 0
Before Change After 10 00 water
1—10
17°C Temperature rises by 8®C 2S°C
1—20
70c Temperature falls by 10°C
'■/Off
1—30
-4°C Temperature decreases by 5°C
•woe
|—40
-2°C Temperature increases by 4°C
© |—50
Work with a partner and explain how you got your -68°C: one of
the lowest air 1—60
answers.
temperatures
=—70
recorded on
Earth