Thursday Maths review

Factorising

100

What is the highest common factor of 15 and 25x

5

200

What is the highest common factor of 32xy and 22xy

2x

300

Factorise 20y+10x

10(2y+x)

400

Factorise 28x² +21x³

7x²(4+3x)

500

-a²+xy+ax-ay

(x-a)(a+y)

Expanding

100

Expand 3(2x+5)

6x+15

200

Expand:

 y(3+2y)

3y+2y²

300

Expand:

5x(2x+3y)

10x²+15xy

400

Expand:

3x²(3+4x+10xy)

9x²+12x³+30x³y

500

Expand:

(2x+3)(4x-1)

8x²+10x-3

Solving

100

Find x

3x+2=14

x=4

200

Find x

(x+2)/4=2

x=6

300

Find x

3x+15-x-10=x+7

x=2

400

Find y if x=5

y=2x-8

y=2

500

Ned kicked 7 goals and 14 behinds in a game of AFL. How many points did he score?

56 points

Mixed bag

100

What is 4³

64

200

What is the 5th prime number

11

300

What is Pythagoras' Theorum

a²=b²+c²

400

What is the prime factorisation of 72

2³x3²

500

How many common factors do 100 and 68 have?

3. (1, 2 and 4)

Trivia

100

What is the minimum size limit for catching a barramundi

58cm

200

Name a city or town in the Northern Territory apart from Darwin

Gove, Alice Springs, Tennant Creek, Palmerston, Katherine

300

Name the Disney movie that came out just before Toy Story 4

Wreck it Ralph 2

400

If I am visiting the Valley of the Kings, what country am I in?

Egypt

500

David Unaipon is on the $50 note. What did he invent?

Automatic sheep shears