Step 1:
Find simpler numbers to solve the problem.
630 feet is about 600 feet.
2 1/2 feet is about 3 feet.
Step 2:
Solve the problem with the simpler numbers.
I will divide, so 600 / 3 = 200 steps.
Step 3:
Change the mixed number divisor to a fraction. Then multiply the dividen by the reciprocal of the divisor:
Sally takes 252 steps to get from one base of the arch to the other.