Before proceeding to the solution of examples and problems be sure to read the theoretical part of the lesson
Highest common factor
1. Find the Greatest Common Factor of each set of numbers.
15, 20.
а) 5; b) 3;
c) 10;
d) 20.
2. Find the Greatest Common Factor of each set of
numbers.
12, 36.
а) 4; b) 12;
c) 6;
d) 8.
3. Find the Greatest Common Factor of each set of
numbers.
72, 60.
а) 16; b)
5;
c) 12; d)
6.
4. Find the Greatest Common Factor of each set of
numbers.
65, 39.
а) 3; b) 11;
c) 15;
d) 13.
5. Find the Greatest Common Factor of each set of
numbers.
95, 76.
а) 21; b) 19;
c) 11;
d) 12.
6. Find the Greatest Common Factor of each set of numbers.
96, 112.
а) 8; b)
24;
c) 16; d)
12.
7. Copy and complete the sentences below:
All the factors
of 12 are 1, 2,
3, _, _, _
All the factors
of 18 are 1, 2,
3, _, _, _
The Highest Common Factor of 12 and 18 is _.
а) 4,
6, 12; 6,
9, 18; 6;
b) 4, 8, 12;
6, 9, 18; 6;
c) 4,
6, 12; 6,
9, 18; 12;
d) 4,
6, 12; 6, 15, 18; 6.
8.
Copy and complete the sentences below:
All the factors
of 20 are 1, 2, _, _,
_, _
All the factors
of 30 are 1, 2, _, _,
_, _, _,
The HCF of 20 and 30 is _.
а) 4, 5,
10, 20; 3,
5, 6, 10, 25, 30; 10;
b) 4, 5,
10, 20; 3,
5, 6, 10,
15, 30; 15;
c) 4, 5, 8, 20;
3, 5, 6,
10, 15, 30; 10;
d) 4, 5,
10, 20; 3,
5, 6, 10,
15, 30; 10.
9. List all the factors of 32
List all the
factors of 40
Write down the HCF of 32 and 40
а) 1,
2, 4, 8,
16, 32; 1,
2, 4, 5, 6, 10,
20, 40; 8;
b) 1,
2, 4, 8, 12, 32;
1, 2, 4,
5, 8, 10,
20, 40; 8;
c) 1,
2, 4, 8,
16, 32; 1,
2, 4, 5,
8, 10, 20,
40; 8;
d) 1,
2, 4, 8,
16, 32; 1,
2, 4, 5,
8, 10, 20,
40; 4.
10. List all the factors of 24
List all the
factors of 36
Write down the HCF of 24 and 36
а) 1, 2,
3, 4, 6,
8, 12, 24;
1, 2, 3,
4, 6, 9, 16, 18,
36; 12;
b) 1, 2, 3, 4, 6, 8, 12, 24; 1, 2, 3, 4, 6, 9, 12, 18, 36; 12;
b) 1, 2, 3, 4, 6, 8, 12, 24; 1, 2, 3, 4, 6, 9, 12, 18, 36; 12;
c) 1,
2, 3, 4,
6, 8, 12,
24; 1, 2,
3, 4, 6,
9, 12, 18,
36; 8;
d) 1, 2, 3, 4, 6, 8, 16, 24; 1, 2, 3, 4, 6, 9, 12, 18, 36; 12.
d) 1, 2, 3, 4, 6, 8, 16, 24; 1, 2, 3, 4, 6, 9, 12, 18, 36; 12.
11. Find the Highest
Common Factor of
8 and 10
а) 2; b) 4;
c) 5;
d) 8.
12. Find the Highest
Common Factor of
10 and 40
а) 5; b) 4;
c) 10; d) 8.
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