5th grade math

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I need help with this problem..the answer and how you got it. thanks

amy gets 1 hour for lunch at her job. today she used 1/4 hour to eat and 2/5 hour to run an errand. she spent the rest of her lunchtime writing a letter. how may minutes did amy spend writhing the letter?

  • 5th grade math -

    1/4 + 2/5

    We need the common denominator.

    1/4 = 5/20
    2/5 = 8/20

    5/20 + 8/20 = 13/20

    13/20 * 60 = 780/20 = 39 minutes

    60 - 39 = 21 minutes

    You could also change 1/4 hour to 15 minutes and 2/5 hour to 24 minutes and then add.

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