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20Exercise

Exercise 1 Q1 In a general knowledge quiz, contestants can

gain points by answering questions correctly but they lose marks for wrong answers. 

 Here are scores for three contestants. 

Sam  Kim Alex

Round 1 15 -9 -7

Round 2 -9 12 15

Round 3 -8 5 -8

TOTAL 

Place the contestants in order of merit.

-2 8 0Answer: Kim – Alex – Sam

Exercise 1 Q2

This graph shows the increase in a baby's weight over the first 4 weeks of its life.What did the baby weigh in week 3? 

 Answer: 4.2kg 

Exercise 1 Q3

 Calculate  3·6 + 1·3 + 1·8 

 Answer: 6·7

Exercise 1 Q4How long does it take Train A to travel from Stirling to Edinburgh?  

Stirling Falkirk Edinburgh

Train A  0715 0733 0812

Train B  1138 1154 1225

Train C  1208 1225 1303

Train D  2313 2341 0017

 Answer: 57 minutes

Exercise 2 Q1Here are five temperatures.    Number the temperatures in order, starting with the coldest. 

 Answer:

-2°C

-4°C

2°C

-5°C

0°C

1

23

4

5

Exercise 2 Q2

 Calculate the difference between 12·45 and 6·987. 

 Answer: 5.463

Exercise 2 Q3

Lisa has £40 to spend. She buys 2 CDs for £14·50 each and a T shirt for £5·99.

How much money has she left?  Answer: £5.01

Exercise 2 Q4David’s Gran is coming to visit him on the third Thursday in June.  Here is the calendar for June.  Write down the date of her visit.  Answer: 16th June

S M T W T F S

1 2 3 4

5 6 7 8 9 10 11

12 13 14 15 16 17 18

19 20 21 22 23 24 25

26 27 28 29 30

Exercise 3 Q1

 12·65 kilograms are cut from a block of cheese weighing 20 kilograms.

What is the weight of the piece remaining?

 Answer: 7.35 kg

Exercise 3 Q2 The results of a survey have been put into a pie chart.The survey was about the colours of cars travelling along a road. 

What percentage of the cars was white? Answer: 25%

Exercise 3 Q3

 How many metres are there in 5 km 40 m?

 Answer: 5040

Exercise 3 Q4

 8 groups of equal size are to be formed from 755 people.

What is the largest group size possible? 

 Answer: 94

Exercise 4 Q1

Calculate2·5 x 7 =

 Answer: 17.5

Exercise 4 Q2

Calculate:11·67 + 8·58

+ 7·5

 Answer: 27.75

Exercise 4 Q3

One CD costs £13·49.How much will 6 CDs cost?

 Answer: £80.94

Exercise 4 Q4

 Answer: A

Which of the following is the greatest value?

A 10% of 500B 50% of 80C 25% of 100D 20% of 200

10% × 500 = 5050% × 80 = 4025% × 100 = 2520% × 200 = 40

Exercise 5 Q1At the start of the month, Gordon has £267 in his bank account.He spends £36·50 on CDs, £29·99 on clothes and £106 on food and travel over the month.How much money has he left at the end of the month?A Less than £90B £90 – £94·99C £95 – £100D £100 – £104·99E £105 or more

36.50 29.99+106.00 172.49

267.00 - 172.49 94.51

 Answer: B

Exercise 5 Q2

Exercise 5 Q3

Exercise 5 Q4