Circumference = Diameter x 3.14. (That sounds about right).
The Earths distance from the sun = 94,500,000 miles, but that could be debated.
Its circumference of travel = 94,500,000 * 3.14 = 296,730,000 miles. (Sort of, discounting any wobble).
Days to circle the sun = 365.4, or 8770 hours (you can prove this by calibrating a sticks shadow to a watch).
Miles per hour = 296,730,000 mile / 8770 hours = 33,834 miles per hour.
Add to that,
The Earth has a circumference of 24,901 miles (at the equator, maybe), (once again with sticks, 2 stick's shadows a mile apart can prove this out)
and there are 24 hours in a day (or something close to that), 
Then we are spinning at 1,000 miles an hour (roughly).