Y8 Masterful Maths

All things Algebra

100

Find x when 7x=77

x=11

200

If x=5, Find y when x=5y

y=1

300

If x=4, Find y when x=2y+3

y=2

400

If y=3, Find x when x² = 4y+4

x=4

500

x+y=15

x=(45-y)/3

y=0

Measurement

100

The formula for the circumference of a circle is:

2pir or pid

200

The area of a circle with radius 2cm is?

12.57 cm²

300

The area of a right angle triangle with sides 16 cm and 12 cm and a hypotnuse of 20 cm is?

=1/2(16 x 12)

=96cm²

400

The area of a triangular prism of height 4cm is 12cm². Find the volume

V=Ah

=4 x 12

=48 cm³

500

The area of the triangular roof of a house is 86m². The length and width of the house are 12m and 16m respectively. Find the area of the house.

A_rectangle=12 x 16

=192m²

Total Area = 192+86 =278m²

Percentages

100

Find 12% as a decimal 

0.12

200

Find 54% of 100

54

300

If 6% of an amount of money is $30, how much is the full amount of money?

$500

400

A jacket has been discounted by 40%. If the sale price is $180, what was the original price of the jacket?

$300

500

Some prize money is shared between 3 students. Abby receives 1/4 of the prize, Evie 1/3 and Molly the remainder. If Molly was given $20, what was the total value of the prize money?

42%=$20

Total =$47.62