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Example 1.10 from Prealgebra, 1.1 Introduction to Whole Numbers
Introduction to Whole Numbers: example 1.10
Round each number to the nearest thousand:
- ⓐ
- ⓑ
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
Solution
ⓐ Locate the thousands place. Underline the digit to the right of the thousands place. The digit to the right of the thousands place is 0. Since 0 is less than 5, we do not change the digit in the thousands place. We then replace all digits to the right of the thousands pace with zeros.
So 147,032 rounded to the nearest thousand is 147,000.ⓑ Locate the thousands place. Underline the digit to the right of the thousands place. The digit to the right of the thousands place is 5. Since 5 is greater than or equal to 5, round up by adding 1 to the 9. Then replace all digits to the right of the thousands place with zeros.
So 29,504 rounded to the nearest thousand is 30,000.Notice that in part ⓑ, when we add thousand to the thousands, the total is thousands. We regroup this as ten thousand and thousands. We add the ten thousand to the ten thousands and put a in the thousands place.
Your turn
The book's Try It right after this example: same idea, new numbers. Only the answer is given.
Round to the nearest thousand:
How did it go?