The fraction of Bobby's sports cards are baseball or football from the given fractions is; 69/100
We are told that Bobby's collection of sports cards has 3/10 baseball cards and 39/100 football cards.
Thus,
Total baseball and football cards = 39/100 + 3/10 = 69/100
We are told that the rest are soccer cards. Thus;
Fraction of soccer cards = 100/100 - 69/100 = 31/100.
In conclusion the fraction of Bobby's sports cards that are baseball or football is 31/100.
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