Chapter 1: Directed Numbers

1.1 Multiplying Integers

Multiplication of an integer with positive integer is the repeated addition of the integer.

For your information, these are the rules for multiplication of integers:

1. (+) x (+) = +
2. (+) x (-) = -
3. (-) x (-) = +
4. (-) x (+) = -

*Remember: Any number multiply by 0 is equal to 0.

Example:

40 x 2 = 80

-4 x 15 = -60

(-20) x (-5) = 100

13 x 0 = 0

This is easy, right?

Now, let us go through Dividing Integers!

Division of an integer with a positive integer is a process of equal grouping or sharing and the division of a negative integer as well.

1. (+) ÷ (+) = +
2. (+) ÷ (-) = -
3. (-) ÷ (-) = +
4. (-) ÷ (+) = -

*If 0 divided of any of the numbers, there is always be 0! But remember, any numbers divided by 0 is undefined!!

Example:

50 ÷ 5 = 10

60 ÷ (-3) = -20

(-100) ÷ 4 = -25

(-81) ÷ (-9) = 9

Thats all for this chapter. We will study for new chapter for next lession.

Tutorials (1) :

1. Calculate each of the following:

a) 2 x 4 x 8 =

b) 5 x (-3) x 8 =

c) (-6) x (-5) x 3 =

d) (-7) x 3 x (-2) =

e) (-6) x (-3) x (-4) =

f) 42 ÷ 6 =

g) (-27) ÷ 3 =

h) 63 ÷ (-9) =

i) (-56) ÷ (-7) =

j) 0 ÷ 8 =

k) 0 ÷ (-6) =