Find the sum of the greatest and the smallest numbers in 42 065,
39 180, 85 633, and 57 636.
Step 1: Find the greatest number and the smallest number.
Compare the ten thousands places in the numbers:
has 8 ten thousands. That's more ten thousands than the other numbers, so it is the greatest number.
has 3 ten thousands. That's fewer ten thousands than the other numbers, so it is the smallest number.
Step 2: Find the sum of .
To add numbers, always start by adding the units digits, then the tens digits, then the hundreds digits, and so on.
Rename 11 tens as 1 hundred and 1 ten. Rename 14 thousands as 1 ten thousand and 4 thousands.