Math Formula

Math Formula

Open Ended

What information does a formula tell you about the variables?

Relationship between the variables

Multiple Choice

Volume of a cuboid, V = L x b x h,

where L = length, b = breadth and h = height.

Given that L = 5 cm, b = 7 cm and h = 2 cm, find the volume of the cuboid.

• 10 cm³

• 14 cm³

• 35 cm³

• 70 cm³

Multiple Choice

Volume of a cuboid, V = L x b x h,

where L = length, b = breadth and h = height.

Given that V = 140 cm³ , b = 7 cm and h = 2 cm, find the length of the cuboid.

• 10 cm

• 14 cm

• 35 cm

• 70 cm

Review of Q4

• V = L x b x h

• 140 = L x 7 x 2

• 140 = 14 L

• 14 L = 140 

• L = 10 cm

Multiple Choice

To convert from degree Fahrenheit, F,  to c degree Celsius , the formula $c=\frac{5\left(f-32\right)}{9}$  .

Convert 104 degree Fahrenheit to c degree Celsius.

• 8 degree Celsius

• 40 degree Celsius

• 58 degree Celsius

• 360 degree Celsius

Multiple Choice

To convert from degree Fahrenheit, F,  to c degree Celsius , the formula $c=\frac{5\left(f-32\right)}{9}$  .

Convert 104 degree Fahrenheit to c degree Celsius.

• 8 degree Celsius

• 40 degree Celsius

• 58 degree Celsius

• 360 degree Celsius

Multiple Choice

Kinetic energy of an object is given by $E=\frac{1}{2}mv^2$  , 

where m = mass of the object and v = speed of the object

Given that E = 16 and v = 4, find the mass of the object.

• 2 kg 

• 4 kg

• 8 kg

• 32 kg

How to construct Math Formula?

Multiple Choice

The diameter of the circle is twice the radius of the circle. Find a formula for the diameter of the circle. Define the variable used.

• d = 1/2 r ,

  
  

  where d = diameter of circle & r = radius of circle

• d = r

  
  

  where d = diameter of circle & r = radius of circle

• d = 2r

  
  

  where d = diameter of circle & r = radius of circle

• 2d = r

  
  

  where d = diameter of circle & r = radius of circle

Open Ended

Qns: The diameter of the circle, d, is twice the radius of the circle, r. Find the formula for the diameter of the circle.

How did you form the formula for the diameter of circle from the above statement?

How to form the formula?

Key concept:

Identify the relationship between the variables in the question

Let's try more questions from WB

WB

p81 Q9(i)

p81 Q8

Hints for Q9(i)

Cost of 1 plant pot -> $x

Cost of m plant pot -> $?

Total cost, C = cost of m plant pots

C = ?

Hints for Q8

Total time = time taken for m A3 posters + time taken for n A4 posters

Use this relationship to find the formula.

T = _____ + _____

Do Q8(ii) on your own.

T = 24( ) + 10( )

T = ?