Kim's age rounded to the nearest 10 is 20. What is the oldest Kim could be?
Kim could be $\square$.
Answer (2)
Kim's age rounded to the nearest 10 is 20.
Determine the range of ages that round to 20, which is 15 to 24.
The oldest possible age Kim could be is 24.
Therefore, Kim could be \boxed{24}.
Explanation
Understanding the Problem Let's analyze the problem. We know that Kim's age, when rounded to the nearest 10, is 20. This means her actual age is somewhere between 15 and 24, inclusive. We want to find the oldest possible age Kim could be.
Rules of Rounding When rounding to the nearest 10, we look at the ones digit. If the ones digit is 0, 1, 2, 3, or 4, we round down to the nearest ten. If the ones digit is 5, 6, 7, 8, or 9, we round up to the nearest ten.
Determining the Oldest Possible Age Since Kim's age rounds to 20, the largest possible ones digit she could have is 4. If she were 25, her age would round up to 30. Therefore, the oldest Kim could be is 24.
Final Answer So, the oldest Kim could be is 24.
Examples
Rounding is a useful skill in everyday life. For example, if you are estimating how much money you need for groceries, you might round the price of each item to the nearest dollar to make the calculation easier. If a banana costs $0.89, you might round it to $1.00. If a loaf of bread costs $3.29, you might round it to $3.00. This makes it easier to estimate the total cost of your groceries.
The oldest Kim could be, given that her age rounds to the nearest ten as 20, is 24. This is because any age from 15 to 24 rounds down to 20 when applying the rules of rounding. Therefore, 24 is the correct answer.
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