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14 August, 11:21

Jane is building a bookcase. she has one board that is 3 m 12 cm long and another that is 3 m 99 cm long. how long are the two boards together in meters?

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  1. 14 August, 12:31
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    when the 2 boards are put together, the total length will be 7 m 11 cm

    Step-by-step explanation:

    the first board has 3 m 12 cm, but since 1 m = 100 cm:

    length board 1 = 3 m 12 cm = 3 * 100 cm + 12 cm = 300 cm + 12 cm = 312 cm

    the same happens with the board 2

    length board 2 = 3m 99 cm = 3 * 100 cm + 99 cm = 300 cm + 99 cm = 399 cm

    the 2 boards together will have

    total length = length board 1 + length board 2 = 312 cm + 399 cm = 711 cm

    since 7 m = 700 cm

    total length = 711 cm = 7 m 11 cm
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