Chapter 4 - Decimals - Summary Exercises - Adding, Subtracting, and Multiplying Decimal Numbers - Page 296: 15

$100

The dollar position is the ones position. To round $99.64 to the ones position, inspect the digit in the tenths position. Since 6 is 5 or greater the digit in the ones position is increased by one (9 becomes 10, 99 becomes 100). Drop all other digits to the right of the ones position.