Securing understanding of percentages

Maths

Checking understanding of percentages

Multiplicative relationships presented graphically

Scaling diagrams for multiplicative relationships

Expressing one number as a percentage of another

Finding a percentage with a multiplier

Increase by a percentage

Decrease by a percentage

Finding the original amount after an increase

Finding the original amount after a decrease

Finding the percentage change

Multiplicative relationships and direct proportion

Graphing direct proportion

Direct proportion in context

Inverse proportion in context

Problem solving with percentages and proportionality

In this unit, pupils develop the skills to calculate a given percentage of an amount. In the percentages unit, this is extended to performing simple and compound interest calculations. 

The multiplicative relationship is extended in this unit by considering percentages and the connections between multiplicative relationships and direct proportion. By building on a secure understanding of fractions and ratio, pupils can see their understanding of multiplicative relationships being extended.

In this unit pupils explore multiplicative relationships with percentages, direct and inverse proportion.

Understanding multiplicative relationships: percentages and proportionality

 __________  means two variables have a constant multiplicative relationship.

Good visual representation. Bars can be split in any way needed. 

Good visual representation with scaled lines.

Concise without visual representation and quick to construct.

Match each representation of proportion to its advantages.

What percentage of 800 is represented by the calculation: 800 ÷ 2 − 8?

What percentage of 650 is represented by the calculation: 650 − 6.5?

Use the double number line to work out 45% of 700.

Using the ratio table or another representation, work out 98% of 860.

Proportionality means two variables have a constant __________ relationship so the variables are in proportion to each other.

Which of the following are correct strategies to find 75% of 200?

Match each percentage question to its answer.

Starting with the calculation with the largest answer, put these percentage calculations in descending order. 

Starter Quiz

Proportionality means two variables have a constant __________ relationship so the variables are in proportion to each other.