LH7a
Practice - Prime Numbers
TRY TO ANSWER IN TWO AND A HALF MINUTES.
QUESTIONS
QUESTIONS
1. Which of the following is a prime number? 3, 4, 6, 9
2. Is 21 a prime number?
3. How many even prime numbers are there?
4. Can you divide one nonprime number by another nonprime number and get a prime number?
ANSWERS
1. 3. 4 is divisible by 2. 6 is divisible by 2 and 3. 9 is divisible by 3.
2. No. 21 is divisible by 3 and 7.
3. Only one: The number 2. All other even numbers are divisible by 2.
4. Sure. For example, divide 20 by 4 and get 5.