G8.10.2 Using a multiplier

Chapter 8.
Percentages

Cambridge Lower Secondary Coursebook 8.

10.2 Using a multiplier

Learning Objective:

After the end of this section you will be able to

• use a multiplier to calculate a percentage increase or decrease.

Getting Started

Compare two methods

Draw

Enter numbers to use a multiplier to increase 45 by 20%.

Multiple Choice

A value is multiplied by 0.27.

What is the percentage change?

• An increase of 27%

• A decrease of 27%

• An increase of 73%

• A decrease of 73%

Multiple Choice

A value is multiplied by 1.09.

What is the percentage change?

• An increase of 90%

• A decrease of 9%

• An increase of 9%

• A decrease of 90%

Fill in the Blank

A value is changed from 80 to 100.

What number was used as the multiplier?

Fill in the Blank

A value is changed by multiplying by 2.35.

What is the percentage change?
___ %

Fill in the Blank

A box holds 35 identical items.

The size of the box is changed so that it now holds 28 of the same items.

Work out the percentage decrease in the number of items that the box holds.

__ %

Draw

During the first three months, most babies will grow by 12.5%.

The length of a baby at birth is 50 cm.

Complete the calculation to use a multiplier to find the approximate length of the baby when it is three months old.

Open Ended

Reflection and Self-assessment

https://bit.ly/G8-Tulip