1 2 3 4 5

2 2 2
A = 2 A = 2 × 3 A = 1

B = 2
4
Find the highest common factor B = 2
3
× 3
2
Find the highest common factor B = 2 × 3

Find the highest common factor of 32 and 80. Find the highest common factor of 75 and 100. Find the highest common factor
of A and B. of A and B. of A and B.

6 7 8 9 10
2 2
A = 2 × 3 A = 2 × 3

Find the highest common factor B = 2 × 3

3
Find the highest common factor B = 2
3
× 3 Find the highest common factor
of 40 and 24. of 6 and 8. of 168 and 147.
Find the highest common factor Find the highest common factor
of A and B. of A and B.

11 12 13 14 15
4 2
A = 2 × 7 A = 5 A = 3 × 5 × 7

B = 2
3
× 3 × 7 Find the highest common factor B = 3 × 5 Find the highest common factor B = 2
3
× 3 × 5

of 48 and 72. Find the highest common factor of 140 and 20. Find the highest common factor
Find the highest common factor
of A and B. of A and B. of A and B.

16 17 A = 2 × 3
2
× 5 18 19 A = 3
2
20
Find the highest common factor B = 2
2
× 3
2
× 5 Find the highest common factor B = 3 × 5 Find the highest common factor
of 10 and 40. of 18 and 12. Find the highest common factor of 126 and 168.
Find the highest common factor
of A and B. of A and B.
21 22 23 24 25
3 7 2 2
A = 2 × 7 A = 2 A = 2 × 3 × 7

B = 7
2
Find the highest common factor B = 2
6
× 3 Find the highest common factor B = 2 × 3
3
× 7

Find the highest common factor of 60 and 90. Find the highest common factor of 105 and 245. Find the highest common factor
of A and B. of A and B. of A and B.

26 27 28 29 30
4 2 6
A = 2 × 3 A = 2 × 7

Find the highest common factor B = 2

5
× 3 Find the highest common factor B = 2
4
× 7 Find the highest common factor
of 280 and 200. of 162 and 405. of 72 and 45.
Find the highest common factor Find the highest common factor
of A and B. of A and B.

31 A = 2
5
× 5 32 33 A = 2
7
× 5 34 35 A = 2
4
× 3
3

B = 2
5
× 11 Find the highest common factor B = 2
4
× 3
2
× 5 Find the highest common factor B = 2
3
× 3
3

of 135 and 495. of 288 and 360.

Find the highest common factor Find the highest common factor Find the highest common factor
of A and B. of A and B. of A and B.

36 37 38 39 40
2 5
A = 2 × 7 A = 2 × 3

Find the highest common factor B = 2

5
× 7 Find the highest common factor B = 2
5 2
× 3 Find the highest common factor
of 432 and 54. of 600 and 120. of 240 and 660.
Find the highest common factor Find the highest common factor
of A and B. of A and B.
 2 2 2
41 42 43 44 45
3 3
A = 2 × 3 × 5 A = 2 × 5 × 7 A = 2 × 3 × 7

B = 2
4
× 3 × 5
2
Find the highest common factor B = 2
2
× 5 × 7 Find the highest common factor B = 2
2 2
× 3 × 7
of 756 and 315. of 288 and 720.
Find the highest common factor Find the highest common factor Find the highest common factor
of A and B. of A and B. of A and B.

46 47 48 49 50
5 2
A = 2 × 5 A = 3 × 7

Find the highest common factor B = 2

5
× 3 × 5 Find the highest common factor B = 3
2 2
× 7 Find the highest common factor
of 180 and 360. of 56 and 14. of 576 and 864.
Find the highest common factor Find the highest common factor
of A and B. of A and B.