secret trail video part 1

For you to solve this puzzle, you need to get from the top number that circle to the bottom number that circle. Now in this case, it says to use subtraction. So you have to go in a consecutive square. So for example, if I went here, what I'm saying is 42 -7. So 42 -7, that's going to be 35. And I have to keep subtracting until I get to ten, so that if I went this way, 35 minus ten, that's going to be 25, and I could say, oh, maybe I'm going to go this way, and I subtract 6, because it gives me the 19, and then I can do the 17 as a factor of 9. But 17 -9 is not ten.