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-<p>
- <span style="font-weight: bold;">
- Guided Practice.
- <br />
- <br />
- </span>
- Example1: The Highest Common Devisor.
- <br />
- <br />
- a. Find the devisors of 24.
- <br style="font-weight: bold;" />
- <br style="font-weight: bold;" />
- <span style="font-weight: bold;">
- Solution:
- </span>
- <br />
- 1;2;3;4;6;8;12and 24 because 24/1=24 ;24/2=12; 24/3=8; 24/4=6; 24/6=4;24/8=3; 24/12=2; 24/24=24 thus the devisors of 24 are 8 which are: 1;2;3;4;6;8;12and 24.
- <br />
- <br />
- b. Find the devisors of 54.
- <br style="font-weight: bold;" />
- <br style="font-weight: bold;" />
- <span style="font-weight: bold;">
- Solution:
- </span>
- <br />
- 1;2;3;6;9;18;27 and 54 because 54/1=54; 54/2=27;54/3=18; 54/9=6; 54/18=3; 54/27=2; 54/54=1
- <br />
- thus the devisors of 54 are 8 which are 1;2;3;6;9;18;27 and 54
- <br />
- <br />
- Example2: Find the Highest Common devisor of 24 and 54
- <br />
- <br />
- <span style="font-weight: bold;">
- Solution:
- </span>
- <br />
- <br />
- <span style="font-weight: bold;">
- Method 1:
- </span>
- <br />
- a) Find the factors of 24=
- <span style="font-weight: bold;">
- 1;2;3
- </span>
- ;4;
- <span style="font-weight: bold;">
- 6
- </span>
- ;8;12;24
- <br />
- b) Find the factors of 54=
- <span style="font-weight: bold;">
- 1;2;3;6
- </span>
- ;9;27;54
- <br />
- <br />
- The Common Devisors of 24and 54 aree 1;2;3 and 6.
- <br />
- so, the highest Common Devisor of 24 and 54 is 6
- <br />
- <br />
- <span style="font-weight: bold;">
- Methode 2:
- </span>
- <br />
- Deviding by Lowest Common devisor.
-</p>
-<table border="1" width="100%">
- <tbody>
- <tr>
- <td width="33%" valign="top">
- Number1
- <br />
- </td>
- <td width="33%" valign="top">
- Number2
- <br />
- </td>
- <td width="33%" valign="top">
- Common devisors
- <br />
- </td>
- </tr>
- <tr>
- <td width="33%" valign="top">
- 24
- <br />
- </td>
- <td width="33%" valign="top">
- 54
- <br />
- </td>
- <td width="33%" valign="top">
- 2
- <br />
- </td>
- </tr>
- <tr>
- <td width="33%" valign="top">
- 12
- <br />
- </td>
- <td width="33%" valign="top">
- 27
- <br />
- </td>
- <td width="33%" valign="top">
- 3
- <br />
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">
- 4
- <br />
- </td>
- <td style="vertical-align: top;">
- 9
- <br />
- </td>
- <td style="vertical-align: top;">
- <br />
- </td>
- </tr>
- </tbody>
-</table>
-<p>
- <br />
- The Higheest Common Devidor is 2*3=6
- <br />
- <br />
- Example3: Find the HCD of this set of numbers.
- <br />
- 24;36;60 and 96
- <br />
- <br />
- <span style="font-weight: bold;">
- Solution:
- </span>
- <br />
- Methode 1:
- <br />
- a) The factors of 24=
- <span style="font-weight: bold;">
- 1;2;3;4;6;8;12
- </span>
- ;24
- <br />
- b) The factors of 36=
- <span style="font-weight: bold;">
- 1;2;3;4;6
- </span>
- ;9;
- <span style="font-weight: bold;">
- 12
- </span>
- ;18;36
- <br />
- c) The factors of 60 =
- <span style="font-weight: bold;">
- 1;2;3;4
- </span>
- ;5;
- <span style="font-weight: bold;">
- 6;
- </span>
- 10;
- <span style="font-weight: bold;">
- 12
- </span>
- ;15;20;30;60
- <br />
- d) The factors of 96=
- <span style="font-weight: bold;">
- 1;2;3;4;6
- </span>
- ;8;
- <span style="font-weight: bold;">
- 12;
- </span>
- 16;24;32;48;96
- <br />
- <br />
- The common devisors of 24;36;60 and 96 are 1;2;3;4;6;12
- <br />
- The highest Common Devidor is 12.
- <br />
- <br />
- Methode 2:
- <br />
- <br />
-</p>
-<table border="1" width="100%">
- <tbody>
- <tr>
- <td width="20%" valign="top">
- Number1
- <br />
- </td>
- <td width="20%" valign="top">
- Number2
- <br />
- </td>
- <td width="20%" valign="top">
- Number3
- <br />
- </td>
- <td width="20%" valign="top">
- Number4
- <br />
- </td>
- <td width="20%" valign="top">
- Common Devisors
- <br />
- </td>
- </tr>
- <tr>
- <td width="20%" valign="top">
- 24
- <br />
- </td>
- <td width="20%" valign="top">
- 36
- <br />
- </td>
- <td width="20%" valign="top">
- 60
- <br />
- </td>
- <td width="20%" valign="top">
- 96
- <br />
- </td>
- <td width="20%" valign="top">
- 2
- <br />
- </td>
- </tr>
- <tr>
- <td width="20%" valign="top">
- 12
- <br />
- </td>
- <td width="20%" valign="top">
- 18
- <br />
- </td>
- <td width="20%" valign="top">
- 30
- <br />
- </td>
- <td width="20%" valign="top">
- 48
- <br />
- </td>
- <td width="20%" valign="top">
- 2
- <br />
- </td>
- </tr>
- <tr>
- <td width="20%" valign="top">
- 6
- <br />
- </td>
- <td width="20%" valign="top">
- 9
- <br />
- </td>
- <td width="20%" valign="top">
- 15
- <br />
- </td>
- <td width="20%" valign="top">
- 24
- <br />
- </td>
- <td width="20%" valign="top">
- 3
- <br />
- </td>
- </tr>
- <tr>
- <td width="20%" valign="top">
- 2
- <br />
- </td>
- <td width="20%" valign="top">
- 3
- <br />
- </td>
- <td width="20%" valign="top">
- 5
- <br />
- </td>
- <td width="20%" valign="top">
- 6
- <br />
- </td>
- <td width="20%" valign="top">
- <br />
- </td>
- </tr>
- </tbody>
-</table>
-<p>
- <br />
- The Highest Common Devidor is: 2*2*3=12
- <br />
- <br />
- <span style="font-weight: bold;">
- Notes to create:
- </span>
- To find the HCD , first ffind the devisors of each numbe, list the commonn devisors and the take the highest(greatest ) or devide by lowest devisor continue to devide until when there is no common devisor other than one and mulltipply the divisors to find the HCD.
- <br />
- <br />
- <span style="font-weight: bold;">
- Notice:
- </span>
- A devisor or factor is a number which devids another.
- <br />
- <br />
- Example3: Find the multiples of 5 and of 11
- <br />
- <br />
- <span style="font-weight: bold;">
- SOLUTION:
- </span>
- <br />
- <br />
- a) The multiples of 5 are: 5;10;15;20;25;30;35;40;........
- <br />
- b) The multiplees of 11 are: 11;22;33;44;55;66;77;........
- <br />
- <br />
- <span style="font-weight: bold;">
- Notes to create:
- </span>
- The multiples of a number are obtained by multiplying that number by the countinng numbers by starting at one.
- <br />
- <br />
- Example4: Find the multiples of 20 less than 90
- <br />
- <br />
- <span style="font-weight: bold;">
- SOLUTION:
- </span>
- <br />
- <br />
- 20*1; 20*2; 20*3; 20*4; 20*5
- <br />
- The multiples of 20 ={20; 40; 60; 80}
- <br />
- <br />
- Example5: Find the Lowest Common Multiples(LCM) of 6 and 9 less than 40.
- <br />
- a) Multiples of 6=6*1; 6*2; 6*3; 6*4; 6*5; 6*6={6; 12;18; 24; 36}
- <br />
- b) Multiples of 9=9*1; 9*2; 9*3; 9*4={9; 18; 36}
- <br />
- <br />
- The common multiples of 6 and 9 are 18 and 36
- <br />
- Thus the Lowest Common Multiples of 6 and 9 is 18.
- <br />
- <br />
- Example 6: Find the LCM of tthis set of numbers.
- <br />
- 12; 28 and 42.
- <br style="font-weight: bold;" />
- <br style="font-weight: bold;" />
- <span style="font-weight: bold;">
- SOLUTION:
- </span>
- <br />
- a) The multiples of 12=12*1; 12*2; 12*3; 12*4; 12*5; 12*6; 12*7; 12*88=
- <br />
- {12; 24; 36; 48; 60; 72;
- <span style="color: #ff0000;">
- 84
- </span>
- ,........}
- <br />
- <br />
- b)) The multipples of 28=28*1; 28*2; 28*3 ; 28*4; 28*5; 28*6;.....=
- <br />
- {28; 46;
- <span style="color: #ff0000;">
- 84
- </span>
- ;.......}
- <br />
- <br />
- c) The multiples of 42=42*1; 42*2; 42*3; 42*4;={42;
- <span style="color: #ff0000;">
- 84
- </span>
- ; ........}
- <br />
- <br />
- The Lowest Common Multiples of 12;28 and 42 is 84
- <br />
- <br />
- <span style="font-weight: bold;">
- Notes to create:
- </span>
- To fid the Lowest Common Multiple, you list the common multiples and then you take the Lowest.
- <br />
- <br />
- Example 7: What are the prime numbers among the following and why.
- <br />
- 1,4,2,7,9,27,17,107,108.
- <br style="font-weight: bold;" />
- <br style="font-weight: bold;" />
- <span style="font-weight: bold;">
- SOLUTION:
- </span>
- <br />
- The prime numbers are {1,2,7,17,107} because you can not find any number other than one and the number itself which can devide thay number.
- <br />
- <br />
- Example 8: Find the prime ffactors of 36 and write 36 as a product of prime factors.
- <br />
- <br style="font-weight: bold;" />
- <span style="font-weight: bold;">
- SOLUTION:
- </span>
- <br />
- <br />
-</p>
-<table border="1" width="100%">
- <tbody>
- <tr>
- <td width="50%" valign="top">
- Number
- <br />
- </td>
- <td width="50%" valign="top">
- Devisor
- <br />
- </td>
- </tr>
- <tr>
- <td width="50%" valign="top">
- 36
- <br />
- </td>
- <td width="50%" valign="top">
- 2
- <br />
- </td>
- </tr>
- <tr>
- <td width="50%" valign="top">
- 18
- <br />
- </td>
- <td width="50%" valign="top">
- 2
- <br />
- </td>
- </tr>
- <tr>
- <td width="50%" valign="top">
- 9
- <br />
- </td>
- <td width="50%" valign="top">
- 3
- <br />
- </td>
- </tr>
- <tr>
- <td width="50%" valign="top">
- 3
- <br />
- </td>
- <td width="50%" valign="top">
- 3
- <br />
- </td>
- </tr>
- <tr>
- <td style="vertical-align: top;">
- 1
- <br />
- </td>
- <td style="vertical-align: top;">
- <br />
- </td>
- </tr>
- </tbody>
-</table>
-<p>
- <br />
- The prime factors of 36 are 2 and 3
- <br />
- therefore 36=2**2*3*3
- <br />
- 36=2
- <sup>
- 2
- </sup>
- *3
- <sup>
- 2
- </sup>
- <sup>
- </sup>
- <sup>
- <br />
- <br />
- </sup>
- Notes to create: To find the prime factors of number, you devide tthat number using prime numbers only by starting at 2.
- <sup>
- <br />
- <br />
- </sup>
- The prime factors are presented as a product of prime fators or in power form.
- <sup>
- <br />
- <br />
- </sup>
-</p> \ No newline at end of file