"A Scale Factor (SF) is the amount between two objects". lets say i have a square the length of the square is 2cm, the top side is 4cm.
Then lets say I have a new square. The length of the square is 4cm, the top of the square is 8cm. The SF would be 2. Because 2 times 2=4. And 4 times 2= 8. =
P.S scale factor already multiplied. So you don't have to say times 2, then it would be times times 2. Hope this helps you, my friend