Mathematics (26 Nov)

Mathematics

(26 Nov 2020)

Revision (Direct and Inverse Proportions)

Materials:

• A4 paper

• stationeries

• calculator

Instructions :

• Questions will be projected.

• You need to write proper working method for each and every question in a piece of paper.

• Once you're done with the question you need to turn on your camera and show your working to the camera.

• Everyone must participate.

• Do not not post your answer at "CHAT"

• You will be given 30 seconds for each questions.

Multiple Choice

a = 70 rounded to the nearest 10

b = 6.6 rounded to one decimal place.

What are the lower and upper bounds of a/b

• 9.17 and 9.92

• 11.5 and 9.92

• 9.77 and 11.45

• 9.77 and 11.28

Fill in the Blanks

In a sale the normal price of a book is reduced by 10%.

The sale price of the book is £5.96

Calculate the normal price of the book.

Provide your answer correct to 2 decimal place.

Multiple Choice

The distance travelled by an object is 18 metres in a time of 1.8 seconds. Both measurements have been given correct to 2 significant figures. Calculate the minimum and maximum possible speed of the object in m/s.

• 9.75 and 10.35

• 9.5 and 10.5

• 9.46 and 10.57

• 10 and 9

Fill in the Blanks

It takes 5 people 12 days to paint a building. Work out how long it would take at the same rate using 6 people.

Provide your answer in days.

Type your answer without spacing and unit.

Fill in the Blanks

In August 2009, Usain Bolt of Jamaica set a world record by running 100m in 9.58 seconds.

How long would it take him to run 480m if he could run it at this speed, in seconds?

Provide your answer correct 3 decimal place.

Multiple Choice

A is inversely proportional to the cube of B

• $A\propto\frac{1}{B}$

• $A\propto\frac{1}{B^2}$

• $A\propto\frac{1}{\sqrt{B}}$

• $A\propto\frac{1}{B^3}$

Multiple Choice

A is inversely proportional to the square of B

• $A\propto\frac{1}{B}$

• $A\propto\frac{1}{B^2}$

• $A\propto\frac{1}{\sqrt{B}}$

• $A\propto\frac{1}{B^3}$

Multiple Choice

Suppose y varies inversely with x.
If y = 150 when x = 2, find y when x = 25.

• 300
• 75
• 1,875
• 12

Multiple Choice

If q is inversely proportional to p² and q=3 when p=5, find an equation connecting p and q.

• $q=\frac{3}{25}\ p^2$

• $q=\frac{3}{25}\ p$

• $q=\ \frac{75}{p}$

• $q=\ \frac{75}{p^2}$

Multiple Choice

 Y varies directly with x, and y is 84 when x is 16. Which equation represents this situation?

• y=1344x
• y=100x
• y=5.25x
• y=4/21x

Fill in the Blanks

In August 2009, Usain Bolt of Jamaica set a world record by running 100m in 9.58 seconds.

Translate this speed into km/h.

Type your answer without spacing and unit.

Provide your answer correct 3 decimal place.

Q&A Session

Anything to ask or clarify????

Topic suggestion for tomorrow

???