it is simple. first lets say you have ......... 10 and 15. here is what you do.
list all the ways to make 10 like the example below. then you list all of the ways to make 15. after that well i will show you.
EXAMPLE. 10- 1x10,2x5 1,2,5,10
15- 1x15,3x5 1,3,5,15 the greatest common factor is 5
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unknown
well, say you have the number 4, and you want to multiply it with 5, but you want 4 to be an unknown factor. X x 5= 20 X=4
The 'X' indicates that the factor is unknown.
His birthday is unknown.
If one factor is 48 and the other is unknown, divide both sides of the equation by 48. 48 x ? = 4608 ? = 96