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SLIDE SHOW INSTRUCTIONS This presentation is completely under your control. This lesson will show only one step at a time, to see the next step you must press a key. (Actual names written on a key are in green) TO STOP THE SLIDE SHOW: press ‘escape’ (Esc, top left of keyboard) TO MOVE FORWARD: press the “spacebar” or Enter (PageDn,  , , also work) TO MOVE BACKWARD: press the  key (PageUp, or  also work)

Copyright©2001 Lynda Greene Factors & Multiples Copyright©2001 Lynda Greene Factors of numbers

Introduction to Factors What are they and how do I find them?

What are factors and how do I find them? Example: Say you want to find the factors of 8. The factors of 8 are all the numbers that will divide into 8 evenly. (In other words, they do not have a remainder) So take the numbers from 1 to 8 and divide 8 by each of them. 8 4 2 remainder 1) 8 2) 8 3) 8 4) 8 If you get an answer with a remainder, the number you divided by is not a factor of 8, so cross out these answers. 1 remainder remainder remainder 5) 8 6) 8 7) 8 8) 8 Now let’s look at the numbers that are left

The numbers on the left are the factors of 8, factors: 1, 2, 4 and 8 1) 8 8) 8 2) 8 4) 8 8 4 2 1 But, did you notice that the numbers on the top and the numbers you divided by (on the left) are the same? That’s because we are finding the factors two at a time, The number on the left and the number on top are both factors of 8. So to save time we don’t have to divide by every number from 1 to 8, we can go halfway and stop.

8 All the factors of 8 are right here in this little box. How do we know when we have gotten halfway and can stop? If you write the factors of the number using the following system, you can see where your stopping point will be. 1) Write the number with two little branches below it 8 2) Starting with ‘1 x 8’ Write all the pairs of factors that divide evenly into 8 All the factors of 8 are right here in this little box. 1 x 8 2 x 4 4 x 2 8 x 1 3) This is where they start to repeat, STOP HERE! You don’t need to write these repeating numbers down

12 32 81 48 Practice: Find the factors of the following numbers 1 x 48 Read the factors in this order We can stop checking numbers as soon as we reach this number 1 x 48 2 x 24 3 x 16 4 x 12 5 : remainder 6 x 8 7 : remainder 1 x 12 2 x 6 3 x 4 1 x 32 2 x 16 4 x 8 1 x 81 3 x 27 9 x 9 Down the left side Up the right side Here’s where the numbers start to repeat 4 x 3, etc. so stop here. 5 : remainder 6 : remainder 7 : remainder 8 x 4(repeat) You can stop here since there are no more numbers between these two factors on the bottom Stop, since the next number is 8 Make sure you check all the numbers up to the number on the bottom right, this is where they start to repeat. Factors of 12: 1, 2, 3, 4, 6, 12 Factors of 81: 1, 3, 9, 27, 81 Factors of 32: 1, 2, 4, 8, 16, 32 Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48

Practice Problems: (Hit enter to see the answers) Find all the possible Factors of the following numbers 1) 48 5) 64 2) 78 6) 75 3) 59 7) 110 4) 32 8) 83 Answers: 1) 1, 2, 3, 4, 6, 8, 12, 16, 24, 48 2) 1, 2, 3, 6, 13, 26, 39, 78 3) 1, 59 (prime number) 4) 1, 2, 4, 8, 16, 32 5) 1, 2, 4, 8, 16, 32, 64 6) 1, 3, 5, 15, 25, 75 7) 1, 2, 5, 10, 11, 22, 55, 110 8) 1, 83 (prime)

Questions? send e-mail to: lgreene1@satx.rr.com End of Tutorial Go to www.greenebox.com for more great math tutorials for your home computer Questions? send e-mail to: lgreene1@satx.rr.com