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To round 1236 to the nearest 100, you need to look at the tens and ones digits. In this case, the tens digit is 3 and the ones digit is 6. Since the tens digit is less than 5, you round down. Therefore, 1236 rounded to the nearest 100 is 1200.
2400
To round 73.4 to the nearest tens place, we look at the digit in the ones place, which is 3. Since 3 is less than 5, we keep the tens place digit the same and change all digits to the right to zero. Therefore, 73.4 rounded to the nearest tens place is 70.
660