Mathematics revision for test 2

 What is the next step for simplifying $\sqrt{2^6\times5^2\times7^4}$  ?

•  $\sqrt{2^3\times5\times7^2}$  

•  $2^3\times5\times7^2$  

•  $\sqrt{2^5\times5\times7^3}$  

•  $2^5\times5\times7^3$  

The floor of a square hall has a side of 20 m. It is filled with chairs, leaving a margin of 1 m wide all round for walking. Find the area of the margin.

• 200 $m^2$

• 200 $cm^2$

• 361 $m^2$

• 324 $m^2$

Find the sum of the first 12 odd numbers.

Find the sum of the first 14 consecutive numbers.

 $1+3+5+......+25+27=?$  

 $1+2+3+4+......+57+58+59=?$  

Complete the following sequence:

196 , 169 , 144 , ____ , ____

* Use ',' to separate your answers and DO NOT insert space!!

Complete the following sequence:

6 , 10 , 15 , 21 , ___ , ____

* Use ',' to separate your answers and DO NOT insert space!!

A logo is designed that has four pink circles within a white square.The square has side length 16cm.

Find the area of the logo that is white.

• $155cm^2$

• $55m^2$

• $54.9cm^2$

Shown is a circular photo surrounded by a frame.

The photo has radius 12cm.

The frame has width 4cm.

Work out area of the frame.

This area is shaded in the diagram.

• $351.86m^2$

• $351.86cm^2$

• $402.12cm^2$