Math Revision 1

GST

100

What is 10% as a decimal?

0.1

200

Calculate the GST on a $50 T-shirt

$5

300

A car costs $15 000, including GST. How would you calculate the original price before GST is added?

$15 000 / 1.1

400

The pre-GST price of a phone is $400. Calculate the total selling price including GST

$440

Substitution

100

If a = 5, calculate b = 3a

15

200

If a = -2, calculate b = 3a

-6

300

If a = 2 and b = -5, calculate c = 2ab

-20

400

If a = -3, calculate b = 15 - a

18

Factorising

100

What does HCF stand for?

Highest common factor

200

What is the HCF: 12a + 3

3

300

What is the highest common factor: 15a² + 10a

5a

400

Factorise: 20b² - 4b

4b(5b - 1)

Wages

100

How many weeks are there in 1 year?

52

200

If Jane earns $8.50 per hour, how much will she earn for a 6 hour shift?

$51

300

Tim's hourly rate is $11.20 and he earns double time on Sundays. How much will he earn for a 4 hour Sunday shift? 

$89.60

400

Steve earns $706.80 for a regular 38 hour week. What is his hourly rate of pay? 

$18.60