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1991-08-20
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Prime Numbes & Factors
1) Which of these numbers are prime ?
21 23 25 27 29
2) What are the next two prime numbers after 3O ?
3) Express the following numbers as prime factors:
1. 48 4. 60 7. 70 10. 100
2. 99 5. 180 8. 96
3. 52 6. 24 9. 64
4) From the numbers 8, 12, 16, 19, 20
a) Which number is a prime number?
b) Which number is a square number?
c) Which is a multiple of 5?
d) Which is a factor of 84?
5) Which of these numbers are prime ?
18, 19, 20, 23,25, 27
Which are square numbers?
6) Express 1728 in prime factors.