NUMBER & INDICES
Write 0.00452 in standard form.
4.52 × 10⁻³
7x − 9 = 19
x = 4
Find the area of a parallelogram
base = 12 cm, height = 7 cm
84 cm²
Simplify 24 : 36
2 : 3
Mean of 8, 12, 15, 5
10
A laptop costs $960. It depreciates by 15%.
Find its new value.
816
(2x − 5)(x + 3)
2x² + x − 15
Find the circumference of a circle
radius = 8 cm
Use π = 3.14
50.24 cm
Share $720 in ratio 4 : 5
$320 and $400
Median of 6, 3, 9, 12, 15
9
45÷43
4-2
Factorise completely:
2x² − 8x − 10
2(x − 5)(x + 1)
Angles in triangle are x, 2x, 3x
x = 30
A shirt costing $80 is increased by 10% and then reduced by 10%.
Find final price.
$79.20
The mean of 5 numbers is 14.
70
A number is increased by 20% and becomes 360.
Find the original number.
300
Solve simultaneously:
2x + 3y = 17
x − y = 1
x = 4, y = 3
Interior angle of regular polygon is 156°.
Find number of sides.
n = 15 sides
The ratio of boys to girls is 3 : 5.
There are 24 boys.
Find number of girls.
40
Two independent events each have probability 0.6.
Find probability both happen.
0.36