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Factor, multiple and prime numbers
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I am a prime number. I am a 2-digit number. My digits have a difference of 7. Who am I?
29
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Okay!
All 2-digit prime numbers have a ones digit of 1, 3, 7 or 9. True or false?
True
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Okay!
I am the fourth prime number after 40. Who am I?
53
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Okay!
I am a prime number. I am between 25 and 42. My units digit is a prime number. Who am I?
37
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Okay!
1 is not a prime number. True or false?
True
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I am the third prime number after 20. Who am I?
31
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All prime numbers are odd numbers. True or fasle?
False
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I am a prime number. I am between 40 and 80. When my digits are reversed I am another prime number. Who am I?
71, 73 or 79
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What is the highest common factor of 8 and 12?
4
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What is the smallest 2-digit prime number?
11
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List three common multiples of 3 and 4.
12, 24, 36, ...
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All prime numbers have exactly two factors. True or false?
True
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There are 4 prime numbers between 10 and 20. True or false?
True
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There are 10 prime numbers less than 30. True or false?
True
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Okay!
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Okay!
I am a prime number. I am between 20 and 70. My digits total is 10. Who am I?
37
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Okay!
List 3 common multiples of 25 and 20?
100, 200, 300, ...
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Okay!
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