Page 48 - Math Smart - 7

Integers
Integers are both positive and negative whole numbers.
They can be represented on a number line.

Negative integers Positive integers

-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10

Zero is neither positive
or negative

Adding integers Subtracting integers

5 + 8 = 13 5+ -8 5 - (-8) = 5 + 8 5 - (-8) = -5 + 8
= 13 = 3

8-(-5) = 8 + 5 = 13 -8)-(-5) = -8 + 5 = -3
5+ -8

Mathematics Connect

Up and down, left and right
The earliest known elevator dates back to the middle of the
19^^ century. But we can trace this form of mechanism right
back to the Greek and Roman times. They were used to lift and
swing things. For example, a shadufvjas used to raise water
from a river. In the same way, we use elevators to reach the top
and bottom of buildings. Your knowledge of integers helps you
to understand how many floors you need to go up or down to
reach your destination. The tallest building, The Burj Khalifa, has
an elevator that reaches 153 floors and covers 504 metres. But
that's just up and down! What about horizontally? In the future
you may be able to travel, vertically, horizontal
and possibly diagonally. How would you use your
knowledge of Integers in this type of elevator?
Use this link to find out more about
Thyssenkrupp's Rope-Free MULTI Elevator System.

UNIT 2 Integers