Unit 4 Section 3 : Operations with Fractions

Here we review how to add, subtract, multiply and divide fractions.

Example 1

Calculate:

(a)		+
(b)		–

Example 2

Calculate:

(a)		×
(b)		×

Example 3

Calculate:

(a)		÷
(b)		÷

Example 4

Calculate:

(a)		×
(b)		÷

Exercises

Question 6
Calculate the area and perimeter of the rectangle shown:

Area =

m²

Perimeter =

m²

Question 10

If the area of the rectangle shown is		m²,
what is the length of the rectangle?

		m

Question 12

(a)

Alan had this special rectangle.

He cut off

of the rectangle.

He had this square left.

Alan put back the piece he had cut off.
He said:

"I've added on

of the square."

He was wrong.

What fraction of the square did he add on?

(b)

Look at shape 1 and shape 2.

What fraction of shape 2 is added on to get back to shape 1?

(c)

Look at the numbers on the bottom of the fractions in (a) and (b).

Suppose you subtract

of a shape.

You want to get back to the shape you started with. What fraction of the new shape would you add on?

(d)

Suppose you subtract

of a shape.

You want to get back to the shape you started with. What fraction of the new shape would you add on?