### Volume and Surface area quetions

1. How much cement is needed to build a sidewalk that is one thousand, one hundred twenty metres long, four metres wide and fifty centimetres thick? Round your answer to the nearest cubic metre.

1120 x 4 x .5 = 2240m3

2240m3 is the amount of cement you need.

But if you're finding surface area, here's how to do it.

1120 x 4 = 4480m x 2 = 8960m

1120 x .5 = 560 x 2 = 1120m

.5 x 4 = 1m x 2 = 2m

8960 + 1120 + 2 = 10082m2

*right? =/*3. If you have five 5 cm by 5 cm x 5 cm aluminum cubes and superglue them together in a row, what is the surface area of the resulting shape made by the five cubes?

First you have to put the five cubes together. So that means that you'll have one long rectangle. The base will be 5cm long. The height will be 25cm long and the width will be 5 cm long.

5 x 5 = 25 x 2 = 50cm

25 x 5 = 125 x 2 = 250cm

25 x 5 = 125 x 2 = 250cm

50 + 250 +250 = 550cm2

So the total surface area is 550 cm2

**annalynaniciete ; nannalyn**

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