Final answer:
Numbers are rounded to the nearest ten or hundred by looking at the specific digit in the ones or tens place, respectively. For example, the number 66 rounds to 70 for the nearest ten and 100 for the nearest hundred.
Step-by-step explanation:
To round a number to the nearest ten, you look at the digit in the ones place. If it is 5 or higher, you round up. If it is 4 or lower, you round down. To round to the nearest hundred, you look at the digit in the tens place with the same rules.
- 66 rounded to the nearest ten is 70, and to the nearest hundred is 100.
- 209 rounded to the nearest ten is 210, and to the nearest hundred is 200.
- 829 rounded to the nearest ten is 830, and to the nearest hundred is 800.
- 663 rounded to the nearest ten is 660, and to the nearest hundred is 700.