What is a reasonable estimate for 776 divided by 38?

77.6 is about twice the value of 38. So d8 must go into 776 2 times, 20 times, 200 times, etc. Changing that 77.6 number back to 776 must add one decimal place to 2 times, and it becomes 20 times.

The actual times is about 20.42, so the estimate was pretty close.