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there are 80 fourth graders in school of these, 35 were boys. what fractional part of the fourth graders were girls

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    to get the fractional part of girls, we first subtract 35 from 80 to get the number of girls:
    80 - 35 = 45
    then we divide this by the total, which is 80:
    45/80
    reduce to lowest term by dividing both numerator and denominator by the GCF (greatest common factor) which is 5:
    45/5 = 9
    80/5 = 16
    thus 45/80 = 9/16

    hope this helps~ :)

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