Junior Cert OL Algebra and Factorising

Maths Words

100

What are prime numbers?

A number divisible by only itself and 1

200

What is a natural number?

A positive whole number

300

What is an integer? 

A positive or negative whole number, including 0

400

What is a rational number?

A number that can be written as a fraction

500

Round 1,689,743 to 2 significant figures

1,700,000

Algebra - Adding and subtracting

100

What is x + 3x

4x

200

What is 7x+12x+6x

25x

300

What is 5x-7x

-2x

400

What is 7x+6x-11x

2x

500

What is 3x+8x-9x+20x-4x

18x

Algebra -Multiplication

100

What is (4)(3x)

12x

200

What is 5(x-2)

5x-10

300

What is 9x(x+3)

9x²+27x

400

What is (x-2)(x+4)

x² +2x-8

or 

x²-2x+4x-8

500

What is (x+1)²

x²+2x+1

or

x²+x+x+1

Factorising

100

3x+9 = 3 (          )

3 (x+3)

200

bx+5b+rx+5r

=b (                )+ ___ (x+5)

b (x+5)+  r(x+5)

300

x²-x-6= (x-3) (______)

(x-3)(x+2)

400

4pq + 6px = (_____)(__________)

2p (2q+3x)

500

x²+9x+14 = (_______)(_______)

(x+7)(x+2)

Mystery Questions

100

What is the mean?

The average. You add up all numbers and divide by the number of elements.

200

What is the difference between a bar chart and histogram?

They look similar but a bar chart has space between each bar, a histogram is stuck together.

300

What does #A=9 mean?

The cardinal number, or number of things in set A is 9

400

What is the missing angle in this triangle?

90

500

Find sin A

sinA=15/17