Answer:
A factor is a number that is multiplied to give the result.
The Greatest Common Factor is the largest number that is a factor of the values considered.
In terns of Prime Factors,
40 = 2 * 2 * 2 * 5
32 = 2 * 2 * 2 * 2 * 2
These two values share (2*2*2), so that is the GCF. The GCF=8.
There can be, at most, 8 teams (note: with 5 girls and 4 boys, the other factor for each value, on each team).
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