Question

A floor 5m by 20m is covered by square tiles of side 20cm. how many tiles are there?

Answer 1

5*20=40 tile :P

Answer 2

What's the area of the floor in square meters? Call that A

Answer 3

Then you need to know the area of a tile in square meters, call that T.

Then the number of tiles you need is A/T.

Answer 4

100m^2/4m^2????

Answer 5

I agree A = 100 m^2. Recalculate T.

Answer 6

The side of a tile is 0.2 m. Hence T = ...

Answer 7

00.4

Answer 8

T = (0.2 m)*(0.2 m) = (0.2)^2 m^2 = ...

Answer 9

Alternatively, the length of the side of a tile is
1/5 m,
as 1/5 = 0.2.

Hence the area of a tile is
\[ T = \left( \frac{1}{5} m \right)^2 = \frac{1}{5^2} m^2 = ... what? \]

Answer 10

lol i really suck

Answer 11

@hc, your answer above is almost right; the decimal point is in the wrong place.

Answer 12

100m^2/00.4m^2

Answer 13

2500

Answer 14

Right, but note: the area of a tile is 0.04 m^2, not 00.4 ...
... because 00.4 = 0.4

Answer 15

thanks james