Year 10 Applied Area

A wall is built of small bricks each of area 100sq cm. 

a)  What is the total area of the front of the wall?

b)  Can you check your answer by working out the area in another way?  If so, show how.

c)  I want to create a doorway type space in the middle of the wall to allow a toy bus that is 10cm wide and 40 cm high to be driven through.  How many bricks need to be taken out?  Show the doorway on the wall drawing above.

Extension – Tough one!

d)  I want to paint the front and the back of the remaining wall with white paint.  If I can paint 1000 cm2 with one tin of paint, how many tins of paint do I need?