This is really cool.... a good trick to pass time during this hot spell!
You'll always get the number 6801 when you follow these instructions.
Step 2: 853
Step 3: 853 - 358 = 495
Step 4: 594
Step 5: 594 + 495 = 1089
When you turn it upside down you get 6801.... Try it!
What happens when you put the same digit in the hundreds and ones?
Adding and Subtracting Decimals:
Practice rounding decimals:
http://mrnussbaum.com/halfcourt/
