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1.1 Integers

What are positive numbers and negative numbers?
CHAPTER
1 In our daily lives, we often encounter situations involving LEARNING
two opposite changes like moving towards right or towards STANDARDS
left; going up or going down; working with values that are Recognise positive and
more than or less than zero; and adjusting to an increase or negative numbers based
decrease of a value. on real-life situations.

These situations can be represented using positive
numbers and negative numbers. For instance,

2nd oor

1st oor

Ground oor
Lower
ground oor

• A lift going up two floors is • The temperature of 45°C at • The temperature of a glacier
written as +2 or 2. a desert is written as +45 which is 10°C below 0°C is
• A lift going down one floor or 45. written as –10.
is written as –1.

Numbers written with the ‘+’ sign or without any sign
–1 is read as
like +2, + 45 or 2, 45 are known as positive numbers. ‘negative one’.

Numbers written with the ‘–’ sign like –1, –10
are known as negative numbers.
1

Car A moves 40 m towards the right while A
car B moves 50 m towards the left. Represent B
the movements of car A and car B using a
positive number or a negative number.

Assume that moving towards the right is represented by a Think Smart
positive number and moving towards the left is represented Can the movement
by a negative number. towards left be
represented with a
Thus, the movement of car A, 40 m towards the right, positive number whereas
is represented as 40 or + 40; the movement of car B, 50 m the movement towards
towards the left, is represented as –50. right be represented
with a negative number?
Explain.

2
Chapter 1

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