Approximate 0.9875 to 1 decimal place.

Analysis

The question asks us to round off the decimal number 0.9875 to 1 decimal place. This means we want only one digit after the decimal point.

Concept: Rounding Decimals

To round a number to a specific decimal place:

1. Identify the digit in the target decimal place (the first digit after the decimal point).
2. Look at the digit immediately to its right (the second decimal place).
3. Rule: If the digit to the right is 5 or greater, round up the target digit by adding 1. If it is less than 5, keep the target digit as it is.

Step-by-Step Solution

1. Identify the target digit: In 0.9875, the first decimal place is 9.
2. Look at the next digit: The digit to the right of 9 is 8.
3. Apply the rule: Since 8 is greater than 5, we must round up the target digit (9).
4. Perform the addition: Adding 1 to 9 gives 10. We write down the 0 and carry over the 1 to the units place. • $0.9 + 0.1 = 1.0$

Therefore, 0.9875 rounded to 1 decimal place is 1.0.

Conclusion

Comparing our result with the given options: A. 1.1 B. 1.0 C. 0.9 D. 0.10

The correct option is B.

Exam Tip

When rounding, always look at the digit immediately to the right of your target place. Do not be distracted by the other digits further to the right (like the 7 and 5 in this question); they do not affect the rounding process once you have determined the status of the digit in the second decimal place.