CHAPTER 1

Question 0

What is 180 km/3 hrs per hour?

Answer 0

= 60km/h

Question 1

HCF and LCM of 8 and 12?

Answer 1

HCF = 4
LCM = 24

Question 2

3/7:1/2?

Answer 2

6/14:7/14

= 6:7

Question 3

$200 divided into 7:3?

Answer 3

7+3 = 10 parts
$200 / 10 = $20
7 x 20 = $140
3 x 20 = $60

= $140:$60

Question 4

Best Buy:
3kg carrots for $6.45
5kg carrots for $10.20

Answer 4

3kg bag: 6.45/3 = $2.15/kg
5kg bag: 10.20/5 = $2.04/kg

= 5kg bag is best buy

        OR

3kg bag: 3/6.45 = 0.465…/$
5kg bag: 5/10.20 = 0.490…/$

= 5kg bag is best buy

Question 5

Compound Interest formula?

Answer 5

A = P (1+R)^n

Eg) $300 at 5% for 3 years
Amount = 300(1+5%)^3
= $3472.88

Question 6

Simple Interest Formula?

Answer 6

I = PRN
= $2000 x 5% x 4
= $400

Amount = P + I
= 2000+4000

= $2400

Question 7

Applying percentages?

Answer 7

(Profit/loss)/(cost price) x 100 %

Question 8

Percentage Increase?

Answer 8

Increase 20 by 6%
= 20 x 6 %
= 1.2 + 20
= 21.2

Question 9

Percentage Decrease?

Answer 9

Decrease $20 by 5%
= $20 x 5%
= 1
= 20-1 
= 19

Question 10

Income and Tax?

Answer 10

Wage: hourly rate with overtime at time and a half (1.5)
Salary: gross income - tax

Question 11

What is amount if 5% of amount = 32

Answer 11

32/5%

=640 is original amount