194588

When I started the addition problems, I noticed that the number I was adding got 10x bigger each time. In the sum, the '1' moved up the place value columns by one column each time. After the first couple of calculations, I was able to use the pattern to predict the calculations.

Although I added each distance separately, I could also easily calculate how much the total would be if I combined all of the extra distances in one sum.

I predicted there would be a similar pattern in the subtraction because the number being subtracted also got 10x bigger each time. I found that in the answer, the '9's disappeared from the place value columns one by one as the amount being subtracted got larger.