Round 128 to the nearest ten.
Understand the Problem
The question is asking how to round the number 128 to the nearest ten. When we round to the nearest ten, we look at the digit in the units place (the 8 in this case) to determine whether to round up or down.
Answer
130
Answer for screen readers
The number 128 rounded to the nearest ten is 130.
Steps to Solve
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Identify the tens and units place In the number 128, the tens digit is 2 and the units digit is 8.
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Determine how to round When rounding to the nearest ten, we check the units digit (8 in this case). If the units digit is 5 or greater, we round up. If it is less than 5, we round down.
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Apply the rounding rule Since the units digit is 8, which is greater than 5, we round up. This means we increase the tens digit (2) by 1.
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Calculate the rounded number After increasing the tens digit, we get: $$ (2 + 1) \times 10 = 3 \times 10 = 30 $$ However, we need to adjust the digits: Instead of changing the originating ten digit, increase it in the hundred's place. The number becomes: $$ 130 $$
The number 128 rounded to the nearest ten is 130.
More Information
Rounding is a common mathematical practice used in everyday life, such as when estimating sums, prices, or measurements. In rounding, knowing whether to round up or down can significantly affect the final result.
Tips
- Confusing whether to round up or down based on the units digit.
- Not adjusting the tens place correctly after rounding.
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