Question

7. How many tiles, each 8 dm square, will be required for a roof 40 metres square?​

Answer 1

Step-by-step explanation:

tiles required for a roof of 40m²(= 4000dm²)

= 4000/8

= 500 tiles

Answer 2

Step-by-step explanation:

1 m = 10 dm

1 dm = 1/10 m

1 m^2 = m x m = 10 dm x 10 dm = 100 dm^2

40 m^2 = 40 x 100 dm^2 = 4000 dm^2

Hence, number of tiles = Total area / area of each tile = 4000 / 8 =500

Therefore 500 tiles are required.

Hope it helps. For solving such problems my advise is that you go through which units are given in the question and convert them into same units

Thank you