Cambridge International Mathematics

6 Assumed Knowledge (Number)

Example 7 Self Tutor

Use your calculator to evaluate: a 12 + 32¥(8¡6) b

75

7+8

a Key in 12 + 32 ¥ ( 8 ¡ 6 ) ENTER Answer: 28

b Key in 75 ¥ ( 7 + 8 ) ENTER Answer: 5

Example 8 Self Tutor

Calculate: a 41 £¡ 7 b ¡ 18 £ 23

a Key in 41 £ (¡) 7 ENTER Answer: ¡ 287

b Key in (¡) 18 £ 23 ENTER Answer: ¡ 414

7 Evaluate each of the following using your calculator:

a 87 + 27£ 13 b (29 + 17)£ 19 c 136 ¥8+16

d 136 ¥(8 + 9) e 39 £¡ 27 f ¡ 128 ¥¡ 32

g

97 +¡ 7

¡ 5 £ 3

h ¡67 + 64¥¡ 4 i

¡ 25 ¡ 15

9 ¡(16¥4)

j (¡3)^4 k ¡ 34 l (¡ 1 :4)^3 £¡ 2 : 72

8 Use a calculator to answer the following questions:

a Kevin can throw a tennis ball 47 : 55 m, and Dean can throw a tennis ball 42 : 8 m. How much

further than Dean can Kevin throw?

b Find the cost of purchasing 2 : 7 kg of bananas at$ 2 : 45 per kilogram.

c Chen travels 11 km on the bus to school each day, and the same distance home. He goes to school

on 205 days in one year. Find the total distance Chen travels on the bus to and from school for

the year.

d June buys 3 packets of sugar weighing 1 : 2 kg each, 4 packets of cereal weighing 1 : 3 kg each, and

2 containers of ice cream weighing 1 : 5 kg each. Find the total weight of these items.

e Jordan is paidE 15 : 60 per hour to work at a petrol station. He wants to saveE 1170 to buy a car.

How many hours will he need to work?

Numbers can be expressed as products of their factors.

Factors that are prime numbers are calledprime factors. The prime factors of any number can be found by

repeated division.

C HCF AND LCM [1.3]

For help using your

calculator, refer to the

on page.

graphics calculator

instructions 11

IGCSE01

cyan magenta yellow black

(^05255075950525507595)
100 100
(^05255075950525507595)
100 100
Y:\HAESE\IGCSE01\IG01_AS\006IGCSE01_AS.CDR Wednesday, 10 September 2008 2:10:44 PM PETER
(Page included on the Student CD only)