Answer
Estimate: 30,000 + 5000 + 2000 + 20,000 + 10,000 = 67,000; Exact: 64,788
Work Step by Step
It seems that the question is rounding 4-digit numbers to the nearest thousand and 5-digit numbers to the nearest ten-thousand, so we round 32,815 down to 30,000 and round 9815 up to 10,000. By adding up the estimates we get 67,000 and by adding up the actual numbers we get 64,788.
