مثال (1) :
جد القاسم المشترك الأكبر بين 150 ، 600
|
  العدد (
150
)
150 2
150 ÷ 2 = 75
75
3 75
÷ 3 = 25
25
5
25 ÷ 5 = 5
5 5
5 ÷ 5 = 1
1
ـ |
  العدد
(
600
)
600 2
600 ÷ 2 = 300
300 2
300 ÷ 2 = 150
150 2
150
÷ 2 = 75
75
3
75
÷ 3 = 25
25 5
25
÷ 5 = 5  
5
5
5
÷ 5 = 1
1
ـ |
\
150 = 2 × 3 × 5 × 5
|
، |
600 = 2 × 2 × 3 × 5 × 5 |
\
القاسم المشترك الأكبر = 2 × 3 × 5 = 30 |
مثال (2) :
جد القاسم المشترك الأكبر بين 252 ، 420
|
  العدد (
252
)
252
2
252 ÷ 2 = 126
126 2
126 ÷ 2 = 63
63
3
63 ÷ 3 = 21
21 3
21 ÷ 3 = 7
7
7
7 ÷ 7 = 1
1 ـ |
  العدد (
420
)
420
2
420 ÷ 2 = 210
210 2
210 ÷ 2 = 105
105 3
105 ÷ 3 = 35
35
5
35 ÷ 5 = 7
7
7
7 ÷ 7 = 1
1 ـ |
\
252 = 2 × 2 × 3 × 3 × 7
|
، |
420 = 2 × 2 × 3 × 5 × 7 |
\
القاسم المشترك الأكبر = 2 × 2 × 3 × 7 = 48 |