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 1. According to the story, how many ﬁsh went back into the river yesterday?

2. Did he throw back more or less number of ﬁsh today? How many ﬁsh went into the basket today?

3 Tomorrow, Grandpa has to really think hard before throwing back the ﬁsh. There is something special about the numbers 2, 3, 5, 7, Can you guess what?

4. How many ﬁsh did Grandpa catch today?

5. A prime number is a number that can be divided exactly by two numbers, one and by itself.

1 can be divided ONLY by 1. So 1 is not a prime number. 13 can be divided by 1. It can be divided by 13. So it is a prime number. 15 can be divided by 1, 3, 5, and 15. So it is not a prime number. Can you count the number of prime numbers between 1 and 50?