Pre-Algebra
Unit 2: Real Numbers
Factors, Multiples, Divisibility
2. 295
1 2 3 4 5 9 10
3. 1608
1 2 3 4 5 9 10
4. 783
1 2 3 4 5 9 10
5. 521
1 2 3 4 5 9 10
List the first four multiples of each number
(starting with zero).
6. 4
Worksheet 2.9
Tell whether each number is prime or
composite.
8. 87
9. 109
Write the prime factorizations of each
number.
10. 54
11. 156
7. 5
Circle the factors of each underlined
number.
12. 444
1 2 3 4 5 9 10
Tell whether each number is prime or
composite.
18. 253
19. 197
13. 2219
1 2 3 4 5 9 10
14. 6540
1 2 3 4 5 9 10
15. 215
1 2 3 4 5 9 10
List the first four multiples of each number
(starting with zero).
16. 10
Write the prime factorizations of each
number.
20. 220
21. 80
17. 1
over
Check yourself: 1) 3 factors 2) 2 factors 3) 4 factors 4) 3 factors
5)1 factor 6) 0, 4, 8, 12 7) 0, 5, 10, 15 8) C 9) P 10) 2∙33 11) 22∙3∙13
Circle the factors of each underlined
number.
1. 248
1 2 3 4 5 9 10
Name:
What missing digit will make each number divisible by 3?
(There may be more than one answer.)
22. 8,390,47,649
23. 93,000,000,00,000,034,789
Answer the following questions.
24. If a is divisible by 2, is a + 1 even or odd?
25. If b is divisible by 7,
a. is 2b divisible by 7?
b. is 2b even or odd?
26. If c is divisible by both 2 and 3,
a. then is it also divisible by 6?
b. then is it also divisible by 12?
27. Tell whether the result will be odd or even.
a. odd  odd
b. odd  even
c. even  even
d. (odd)2
e. (even)2