Before proceeding to the solution of examples and problems be sure to read the theoretical part of the lesson
Factors and prime numbers
1. Write down all the factors of the following numbers:
8
а) 1, 3, 4, 8;
b) 1, 2, 4, 6;
c) 1, 2, 5, 8;
d) 1, 2, 4, 8.
2. Write down all the factors of the following
numbers:
16
а) 1,
2, 3, 8, 16;
b) 1,
2, 6, 8, 16;
c) 1,
2, 4, 8, 16;
d) 1,
2, 4, 6, 16.
3. Write down all the factors of the following
numbers:
11
а) 1; b) 1, 11;
c) 1, 3, 11; d)
11.
4. Write down all the factors of the following
numbers:
15
а) 1, 3,
5, 15;
b) 1,
3, 7, 15;
c) 1,
3, 5, 13;
d) 1, 2, 5, 15.
5. Write down all the factors of the following
numbers:
24
а) 1, 2,
3, 4, 6, 7, 12, 24;
b) 1, 2, 3,
4, 5, 8,
12, 24;
c) 1,
2, 3, 4,
6, 8, 12, 24;
d) 1,
2, 3, 4,
6, 8, 14, 24.
6. Write down all the factors of the following numbers:
19
а) 19; b) 1, 19;
c) 0; d)
1.
7. Write down all the factors of the following numbers:
35
а) 1, 3, 5, 35;
b) 1,
5, 7, 37;
c) 1,
5, 9, 35;
d) 1,
5, 7, 35.
8. Write down all the factors of the following
numbers:
28
а) 1,
2, 4, 7,
14, 28;
b) 1,
2, 5, 7,
14, 28;
c) 1,
2, 4, 6, 14, 28;
d) 1,
2, 4, 7, 12, 28.
9. Write down all the factors of the following
numbers:
40
а) 1,
2, 3, 5,
8, 10, 20, 40;
b) 1,
2, 4, 5,
8, 10, 20, 40;
c) 1,
2, 4, 5, 6, 10,
20, 40;
d) 1,
2, 4, 5,
8, 12, 20, 40.
10. Write down
all the factors of the following numbers:
23
а) 23; b)
0;
c) 1, 23; d) 1.
11. Write down
all the factors of the following numbers:
30
а) 1,
2, 3, 5, 6, 12, 15, 30;
b) 1,
2, 4, 5, 6, 10, 15, 30;
c) 1,
2, 3, 5, 8, 10, 15, 30;
d) 1,
2, 3, 5, 6, 10, 15, 30.
12. Write down
all the factors of the following numbers:
42
а) 1,
2, 3, 5, 7, 14,
21, 42;
b) 1,
2, 3, 6,
7, 12, 21, 42;
c) 1,
2, 3, 6,
7, 14, 21, 42;
d) 1,
2, 3, 6,
7, 14, 28, 42.
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