Maths Paper 2 (Calculator)

Lethna worked out 2/5 + 1/2 She wrote: 2/5 + 1/2 = 2/10 + 1/10 = 3/10 The answer of 3/10 is wrong Describe one mistake that Lethna made.

She didn't multiply the 1 by 5

The manager of a clothes shop recorded the size of each dress sold one morning. 10 10 12 12 14 14 14 14 14 14 16 16 16 16 18 18 18 20 20 20 The sizes of dresses are always even numbers. The mean size of the dresses sold that morning is 15.3 The manager says "the mean size of the dresses is NOT a very useful average." Explain why the manager is right.

The manager is right because the mean is a decimal.

Write down the value of the 3 in 16.35

Three tenths

Becky has some marbles. Chris has two times as many marbles as Becky. Dan has seven more marbles than Chris. They have a total of 57 marbles. Dan says, "if I give some marbles to Becky, each of us will have the same number of marbles". Is Dan correct? You must show how you get your answer.

Two of x,2x and 2x + 7 5 + 10 + 17 = 32 x + 2x + 2x+7 = 57 10 + 20 + 27 = 57

Michelle and Wayne have saved a total of £458 for their holiday. Wayne saved £72 more than Michelle. How much did Wayne Save?

£458 - £72 = £386 £386 (divided) 2 = £193 Wayne saved = £193

In a shop, the normal price of a coat is £65 The shop has a sale. In week 1 of the sale, the price of the coat is reduced by 20% In week 2 of the sale, the price of the coat is reduced by a further £10 Maria has £40 Does Maria have enough money to buy the coat in week 2 of the sale? You must show how you get your answer.

£65 (divided) 100 = 0.65 0.65 x 20 = £13 £65 - £13 = £52 £52 - £10 = £42 No she does not have enough money.

Solve 5(e + 7) = 20

-3 + 7 = 4 5 x 4 = 20 Answer = -3

Here are four fractions. 1/2 17/24 3/4 5/12 Write these fractions in order of size. start with the smallest.

1/2 = 0.5 17/24 = 0.7083 3/4 = 0.75 5/12 = 0.416 5/12 1/2 17/24 3/4

Work out 70% of £90

10% = £9 9 x 7 = 63 70% of £90 = £63

Write 0.21 as a fraction

21/100

Work out 4/5 of 210cm

210 (divided) 5 = 42 42 x 4 = 168

A shop sells pens at different prices. The cheapest pens in the shop cost 27p each. Lottie buys 18 pens from the shop. She pays with a £10 note. If Lottie buys 18 of the cheapest pens, how much change should Lottie get.

27p x 18 = £4.86 £10.00 - £4.86 = £5.14 change left = £5.14

The length of a car is 3.6 metres. Karl makes a scale model of the car. He uses a scale of 1cm to 30cm. Work out the length of the scale model of the car. Give your answer in centimetres.

3.6 x 100 = 360 360 (divided) 30 = 12cm

The grouped frequency table gives information about the heights of 30 students. Height(h cm) Frequency 130 < h \< 140 1 140 < h \<150 7 150 < h \< 160 8 160 < h \<170 10 170 < h \<180 4 Write down the modal class interval.

30 (divided) 5 = 6 modal class = 140 < h \> 150

Make t the subject of the formula w = 3t + 11

3t = w t = w - 11 (divide) 3

Solve 4c + 5 = 11

4 x 1.5 = 6 6 + 5 = 11

Here are the heights, in centimetres, of 15 children. 123 147 135 150 147 129 148 149 125 137 133 138 133 130 151 One of the children is chosen at random. What is the probability that this child has a height greater than 140cm?

6/12 = 2/5

Simplify 5f-f+2f Simplify 2 x m x n x 8 Simplify t squared + t squared

6f 16mn 2t squared

Here is a list of ingredients for making 16 mince pies. Ingredients for 16 mince pies 240g of butter 350g of flour 100g of sugar 280g of mincemeat Elaine wants to make 72 mince pies. How much of each ingredient will Elaine need?

72 (divide) 16 = 4.5 240 x 4.5 = 1080 350 x 4.5 = 1575 100 x 4.5 = 450 280 x 4.5 = 1260 Butter - 1080g Flour - 1575g Sugar - 450g Mincemeat - 1260g

Toby invested £7500 for 2 years in a savings account. He was paid 4% per annum compound interest. How much money did Toby have in his savings account at the end of 2 years?

7500 x 1.04(squared) = £8112 Amount of money in his savings account = £8112

Here is a list of six numbers. 1 3 6 9 12 24 Which number in the list is NOT a factor of 24

9