Figure B is a scaled copy of Figure A. Figure B
44
Figure A
22
20
10
32
40
80
64
What is the scale factor from Figure A to Figure B?

Scale factor = 2

Explanation:

Pick on any pair of corresponding sides. I'll pick the right-most sides of each figure. For figure A, that would be the side of 40 units. Figure B has this corresponding side be 80 units long.

The scale factor is 80/40 = 2. This shows that figure B has sides 2 times longer compared to the corresponding sides on figure A.

So in short all you do is divide the corresponding side lengths. We divide in the format (figureB)/(figureA) because of the transition from A to B, and not the other way around.