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You plan to construct a brick wall measuring 4.5 m in length, 1.2 m high, and 0.5 m in width. If a brick measures 20 cm x 9 cm x 5 cm, how many bricks will you need?

Total volume (to the nearest tenth) = ________ cubic meters. The number of bricks =_________ .

  • Math -

    First find the volume of the wall.

    V = LWH

    Find the volume of each brick.

    Then convert that to cubic centimeters.

    1 cubic meter = 1 000 000 cubic centimeters

  • Math -

    volume of wall is 2.7
    vol of each brick= 900
    900,000,000
    Is that how many bricks? Sounds like alot. Am I missing a step

  • Math -

    Right -- the volume of the wall is 2.7 cubic meters = 2,700,000 cubic centimeters

    Each brick's volume is 900 cubic centimeters.

    Here's your mistake. You need to divide, not multiply.

    2,700,000 / 900 = 3,000 bricks

  • Math -

    got it. thanks again

  • Math -

    :-) You're welcome.

  • Math -

    a baseball measures 2 11/16 inches in diameter. What is its volume ( to the nearest hundredth )

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