Year 9 Maths End of Term 3

Area

100

Formula of a Rectangle

length x width

200

Formula of a Triangle

A = 1/2 length x width

300

Circumference of a semi-circle

2π r/2 or π d/2

400

Area of a trapezium

A = 1/2(a+b)h

Expanding

100

Expand 2(x+2)

2x + 4

200

Expand -2(x-3)

-2x +6

300

Expand (2x + 1)(x - 2)

2x^2 -3x -2

400

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

6x^3 + 17x^2 -31x -12

Factorising

100

Find the HCF of 30 and 18

6

200

Factorise 3x - xy

x(3-y)

300

Factorise 3(x +2) +x(x + 2)

(x + 2)(3 + x)

400

Factorise 4ab - 7ac + 4bd - 7cd

(4b - 7c)(a +d)

Fun Facts

100

 How many sides does a nonagon have?

9

200

What is the only number that does not have its Roman numeral?

0

300

What is the mathematical term for the fear of numbers?

Arithmophobia.

400

Do you know the original name used for the number 0?

Cipher