Counting Up

Subtract two numbers by starting with the smallest number and counting up.
 * 1) First, add a number that will get you to a factor of 10 (e.g., 86 + 4 = 90).
 * 2) Next, add tens until you get close to your final number (e.g., 90 + 10 = 100).
 * 3) Then, add smaller numbers until you reach your final answer (e.g., 100 + 1 = 101).
 * 4) Finally, add up all the steps you took (e.g., 4 + 10 + 1 = 15). This is your answer.