Year 9 Maths Term 1

Wages

100

Liam earns $20 and works 40 hours a week. What is his weekly pay?

$800

200

Charlotte earns $72,000 per year. How much is this per month?

$6000

300

Rhylie earns $20 per hour. What is her overtime pay per hour when she earns time and a half?

$30

400

Bray earns $12 per hour for 10 hours and then time and a half for a further 5 hours. what is his total pay for the 15 hours.

$210

500

Gigi earns $16 per hour and then gets a 25% pay rise. What is her new hourly rate?

$20 per hour

Percentages

100

What is 25% as a decimal?

0.25

200

What is 0.07 as a percentage?

7%

300

What is 30% of 250

75

400

Increase 150 by 10%

165

500

Decrease 500 by 18%

410

Pythagoras

100

What is the rule to find the hypotenuse using Pythagoras' Theorem?

a² + b² = c²

200

What is the rule to find a short side using Pythagoras' Theorem?

b² = c² - a²     or    a² = c² - b² 

300

Would these three side lengths make a right angled triangle  5, 12, 13?

YES!

400

Calculate the hypotenuse of a triangle with short side lengths = 5 and 8. (1.d.p.)

9.4

500

Calculate the short side of a triangle with side lengths 15 and 12.

9

Linear equations

100

Solve for X.

3x - 2 = 13

x = 5

200

Solve for x.

19 = 4x + 3

x = 4

300

Solve for x

 6x = 30

x = 5

400

3(2x + 1) = 15

X = 2

500

Calculate

(x + 2)(3x + 5)

3x²  + 11x  + 10

Graphing

100

Which of these letters is the gradient?

y = mx + c

m

200

Find the gradient

(2, 0) (8, 3)

1/2 or 0.5 or a half

300

Find the gradient

(-1, 4) (1, -2)

-3

400

Find the gradient

(5, 0) (0, -5)

1

500

These coordinates (2, 5) (4, 13) give a gradient of 4.

Calculate the y intercept

-3