143 rounded to the nearest ten is 140.
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139 rounded to the nearest ten is 140,
140
Well, isn't that a happy little number! When we round 143 to the nearest ten, it becomes 140. You see, we look at the digit in the tens place, which is 4 in this case, and since it's less than 5, we keep the tens place as it is and change all the digits to the right to zero.
140
140