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 20 October 2014

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# Percentages - lesson plan

### Objectives

1. To understand the meaning of per cent.
2. To work out percentages of 100 and convert them into fractions and decimals.

Ma2, 2e, 2f.

### Resources

• Online activities:
• Worksheets:
• Other resources:
• 10 x 10 class multiplication grid or pre-drawn large 100-square grid
• Interactive whiteboard
• Squared paper
• Sheets of shapes with shaded areas

### Teaching activities

#### Introduction

1. Display page 1 of the revision bite on the whiteboard.
2. Discuss and revise the meaning of per cent and the origin of the word ('cent' means hundred).
3. Look at page 2 of the revision bite together, which shows a grid with a 'percentage' of squares shaded.
4. Emphasise the fact that the grid is made of 100 squares.
5. On the 10 x 10 multiplication grid or large 100-square grid, cover up or colour in some of the squares and ask children what percentage is either covered or showing.
6. Continue through the revision bite pages to revise converting percentages into decimals and fractions.

#### Activity

Demonstrate the Bitesize percentages activity using the whiteboard. Show the children how to drag objects onto the grid. Once they understand how to use the activity, ask them to take it in turns to work through the rest of the program in small groups or pairs on the class computer. Give the rest of the class a similar activity on squared paper while they wait to use the computer.

Lower ability - Ask the children to outline 100 squares on a piece of squared paper to represent a square pizza. Explain they will be adding toppings to the pizza using percentages in multiples of 10 (e.g. 30% cheese, 20% tomato, 10% mushrooms and so on).

Middle ability - Ask the children to outline 100 squares on a piece of squared paper and, within it, to draw areas for different playground apparatus (slide, swings, monkey bars and so on). Explain that some areas can be multiples of 10 but some should not be (e.g. swings 14% of the playground). Ask them to then write down the percentage of the area each piece of apparatus took up and afterwards to convert these figures into decimals and fractions.

Higher ability - Ask the children to outline 100 squares on a piece of squared paper and, within it, to draw areas for different playground apparatus (slide, swings, monkey bars and so on). Explain that they should not include multiples of 10 on their playground. Ask them to then write down the percentage of the area each piece of apparatus took up and afterwards to convert these figures into decimals and fractions.

#### Plenary

Ask one or two pupils to present their playground design and explain how they converted the percentages into fractions and decimals.

#### Extension

Ask the children to work through the Bitesize percentages quiz or complete the Percentages worksheet(PDF 49KB).

#### Homework

Give the children a sheet of shapes with shaded areas that need to be converted into fractions or decimals and vice versa.