Lesson 1 - Percentages with multipliers

Objective

To use multipliers to calculate percentages on a calculator

Resources

Calculators, IWB, computers for extension [optional]

Starter

Run the L1 starter and lesson presentation. Ask the students to look at the percentages and decimals on the board and to match them up. With higher ability students this can be done orally or in their exercise books, with less able groups students may like to come up to the board and draw on the lines [click on the pen tool at the bottom of the screen to be able to draw on the slide, to stop drawing and continue the powerpoint press escape]. Ask students to explain how they can change percentages and ask them why 50% is not written as 0.50 in the decimal.

Lesson

Progress further through the L1 starter and lesson presentation to get students used to how multipliers can be used when finding percentages, go through two examples on the board. Ask students to try the second example by themselves [either on calculator or in books] before you reveal the answer. To check understanding go through matching activity. Again, you can ask students to come to the board to draw lines on the powerpoint or to do these in their books. With higher ability pupils you might want to get them to ‘estimate’ their answers without using a calculator.

Activity

If you have access to computers, get students to open up L1 worksheet on their computers. The crossnumber is conditionally formatted so if students work out the correct answers to the crossnumber then the cells will turn green and students will then be able to ensure they have got the correct answer. [Beware those students who try to guess until it turns green!].

If you do not have computers available print out the worksheet and students can go through it themselves. You can use the spreadsheet on the interactive whiteboard when they have finished the activity to check their answers.

Ask more able students to open up [or hand out copies] of the extension activity which involves percentages of percentages. Encourage students to use multipliers to work out these calculations and to only press equals once on their calculator for each question. Again, the spreadsheet is conditionally formatted so they should get instant feedback if the answer they input is correct.

Plenary

At the end of the lesson open up the presentation Plenary L1. Students can take it in turns to choose letters and match up question and answer. You may choose to do this with or without a calculator depending on the ability of the class. You can play it as a team game for larger classes keeping a note of how many matches each team gets. When a team gets a correct match.

Download the lesson 1 plan in Word format

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