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To round 31 to the nearest ten, we look at the digit in the tens place, which is 3. Since 3 is closer to 0 than to 10, we round down to the nearest ten. Therefore, 31 rounded to the nearest ten is 30.
The 7 is in the ten-thousandths place. There is no digit in the ten thousands place.
The digit in the ten thousandths place is the 1.
The product of the ten one-digit numbers is 0.
It is the digit 1 that occupies the ten thousandths place