What if Craig doesn’t have a calculator?

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Presentation transcript:

What if Craig doesn’t have a calculator? £2.40 £2.10 X0.875 What if Craig doesn’t have a calculator?

Explain how he filled it in

What percentage is there once 12% has been added? 112% In 2015 a car cost £12500. In 2016, the cost has risen by 12% What percentage is there once 12% has been added? 112% Draw a ratio table to find the cost in 2016 Percentage 100% 112% Price (£) 12500 ? (You can add more columns if you need to)

X 1.12 In 2015 a car cost £12500. In 2016, the cost has risen by 12% Percentage 100% 112% Price (£) 12500 ? X 1.12 What if we had a calculator? What would the multiplier be?

X 1.06 In 2015 a season ticket cost £780. In 2016, the cost has risen by 6% Percentage 100% 106% Price (£) 12500 ? X 1.06 What would the multiplier be?

Complete these sentences: 1. To find a 15% increase, the multiplier is… 2. To find a 22% increase, the multiplier is… 3. To find a 6% increase, the multiplier is… 4. To find a 2.5% increase, the multiplier is… 5. To find a 150% increase, the multiplier is…

On your whiteboards: Use your calculator to increase £200 by 7% £214 X1.07

288.96 258 X1.12 Use your calculator to increase £258 by 12% On your whiteboards: Use your calculator to increase £258 by 12% 258 288.96 X1.12

81 85.86 x 1.06 Use your calculator to increase £81 by 6% On your whiteboards: Use your calculator to increase £81 by 6% 81 85.86 x 1.06

On your whiteboards: Use a ratio table to increase £36 by 15% Percentage 100% 115% Price (£) 36 ? (You can add more columns if you need to)

Use a ratio table to increase £304 by 35% On your whiteboards: Use a ratio table to increase £304 by 35% Percentage 100% 135% Price (£) 36 ? (You can add more columns if you need to)

Complete the worksheet by finding the percentage increase or decrease using a ratio table (without a calculator) and a multiplier (with a calculator). *Be careful to check whether it is a percentage increase or decrease.

Find Card 1… Write your card number here 1 Work out the answer on your whiteboard. Find the answer which will appear at the top of another card that you have to find then repeat. When you have found all of the cards, add up the numbers in the squares and write them in one box. Then put the total for the circles in the other box