With Hints The Optional hints help students progress

With Hints The Optional hints help students progress through a multi-step exam-style question with hints question The. For student peer or self-marking solution Use: • with ‘Hints for printing’ when different hints are required for different students Your turn • when a worksheet is needed • when hints are no longer required • to focus on QWC Use with ‘Your turn’ when different Hints for printing hints are required for different students Mark this wrong answer using the mark Marking exercise scheme on ‘The Solution’ slide Provides correct marking and possible Feedback for the ‘Marking Exercise’ Students can assess what they still need to learn and the grade they are Reflection working at. Content covered Print so students can learn the key Test yourself cards points. Take home or work in pairs. Functional Best buy

With Hints – Content covered F Percentages Understand that percentages mean hundredths E Calculation Break a complex calculation into simpler steps D Decimals Multiply and divide decimals by whole numbers D Percentages C Calculation Calculate percentages of an amount Multiply and divide numbers by multiples of powers of 10 C Percentages Calculate percentage increase and decrease Reflection Functional Best buy

Hints and their solutions can be revealed as needed by clicking on With Hints – The question with hints the appropriate box. (A hard copy may be useful for reference during the lesson) Don wants to buy 12 tins of spaghetti hoops. Two supermarkets have these special offers. Sharpshop Lowprice Spaghetti hoops Normal price 60 p Normal price 56 p Special offer 40 % off all tins Buy 2 tins get 1 free Which is cheaper? You must show your working. 5 marks What is 40% of 60 p? 0. 4 x 60 p = 24 p What is the offer price per tin at Sharpshop? 60 p – 24 p = 36 p What is the cost of 12 tine at Sharpshop? 12 x 36 p = £ 4. 32 How many tins must he buy at Lowprice? 8 tins What does he pay to get 12 tins at Lowprice? 8 x 56 p = £ 4. 48 Which is less? Functional Best buy

With Hints – The solution Don wants to buy 12 tins of spaghetti hoops. Two supermarkets have these special offers. Sharpshop Spaghetti hoops Normal price 60 p Special offer 40 % off all tins Lowprice Spaghetti hoops Normal price 56 p Special offer Buy 2 tins get 1 free Three kinds of marks can be given: • B for something being correct, irrespective of method • M for carrying out a correct step • A for a correct answer Reduction at Sharpshop = 0. 4 x 60 p = 24 p Offer price at Sharpshop = 60 p – 24 p = 36 p Cost of 12 tins at Sharpshop = 12 x 36 p = £ 4. 32 M A No. of tins to buy at Lowprice = ⅔ of 12 = 8 tins Cost of those tins = 8 x 56 p = £ 4. 48 M So Sharpshop is cheaper at £ 4. 32 B Which is cheaper? You must show your working. 5 marks Functional Best buy B

With Hints – Your turn Don wants to buy 12 tins of spaghetti hoops. Two supermarkets have these special offers. Sharpshop Spaghetti hoops Normal price 60 p Special offer 40 % off all tins Which is cheaper? You must show your working. 5 marks Lowprice Spaghetti hoops Normal price 56 p Special offer Buy 2 tins get 1 free Write out your own solution to the question. Explain each step carefully. How could you make this question harder? Functional Best buy

With Hints – Hints for printing What is 40% of 60 p? What is the offer price per tin at Sharpshop? What is the cost of 12 tine at Sharpshop? How many tins must he buy at Lowprice? What does he pay to get 12 tins at Lowprice? Which is less? Functional Best buy

With Hints - Marking exercise Don wants to buy 12 tins of spaghetti hoops. Two supermarkets have these special offers. Sharpshop Spaghetti hoops Normal price 60 p Special offer 40 % off all tins Lowprice Spaghetti hoops Normal price 56 p Special offer Buy 2 tins get 1 free Which is cheaper? You must show your working. 5 marks Mark this answer Offer price at Sharpshop = 24 p Cost of 12 tins at Sharpshop = 12 x 24 p = £ 2. 88 No. of tins to buy at Lowprice = 12 Cost of those tins = 12 x 56 p = £ 6. 72 So Sharpshop is cheaper at £ 2. 88 What feedback would you give this person? Functional Best buy

With Hints – Feedback Don wants to buy 12 tins of spaghetti hoops. Two supermarkets have these special offers. Sharpshop Spaghetti hoops Normal price 60 p Special offer 40 % off all tins Offer price at Sharpshop = 24 p Cost of 12 tins at Sharpshop = 12 x 24 p = £ 2. 88 No. of tins to buy at Lowprice = 12 Lowprice Spaghetti hoops Normal price 56 p Special offer Buy 2 tins get 1 free Cost of those tins = 12 x 56 p = £ 6. 72 So Sharpshop is cheaper at £ 2. 88 M A B M B Which is cheaper? You must show your working. Examiner note: Many candidates confuse ‘of’ with ‘off’ Showing the working meant that the M mark could be awarded. Read the question carefully – of is not the same as off. Check that your answer is sensible – would there really be that much difference? Functional Best buy

With Hints – Reflection Click below the button to reveal the grades I Can Understand that percentages mean hundredths Multiply and divide decimals by whole numbers Calculate percentages of an amount Multiply and divide numbers by multiples of powers of 10 Calculate percentage increase and decrease Self assess • Find or write some evidence to support your assessment • Write down your next steps • You may wish to use the Test Yourself cards. Functional Best buy F D D C C

With Hints – Test yourself cards These cards have things you may need to learn in order to do Best buy questions. Copy down the ones YOU need or ask your teacher for a printout. How do you add or subtract decimals? How do calculate percentage change? Line up the decimal points. Form a fraction of the change over the original and convert to a percentage. How do you change a decimal to a percentage? How do you change a percentage to a decimal? Multiply by 100. Divide by 100. What does per cent mean? How do you calculate a percentage of an amount? Out of 100. Divide it by 100 then multiply by the percentage. How do you multiply decimals? How do you divide decimals? Do the whole number version, then estimate the answer in order to put the decimal point in the right place. Functional Best buy