In the Round Rounding Numbers

Learning About It Buttons have been ordered for the Juneteenth volunteers. So far, 37 students have signed up. About how many students is that, rounded to the nearest ten?

Solving the Problem Round 37 to the nearest ten. Use a number line. 37 is between 30 and 40. Find the 30 and 40 on the number line. 35 is halfway between the 30 and 40. Is 37 closer to the number 30 or the number 40?

Solution As you can see on the number line, 37 is closer to 40. Therefore, the number 37 would be rounded up to 40.

More Practice What if only 34 students volunteered? About how many students would that be, rounded to the nearest ten?

Solving the Problem 34 is between 30 and 40. Look at a number line and find the number 30 and the number 40. Is 34 closer to the number 30 or the number 40?

Solution As you can see on the number line, 34 is closer to 30 than it is to 40. Therefore, the number 34 would be rounded down to 30. About 30 students would have volunteered.

Think and Discuss Thirty-five is halfway between 30 and 40. How does knowing the halfway point between tens help you round? What is the halfway point between hundreds? Thousands?

Test Yourself Round 750 to the nearest hundred.

Solution 750 is halfway between 700 and 800. When a number is halfway, round up. The answer to what is 750 rounded to the nearest hundred is 800.

Test Yourself Round 52,382 to the nearest thousand.

Solution 52,500 is halfway between 52,000 and 53,000. 52,382 is less than halfway, so round down. 52,382 rounded to the nearest thousand is 52,000.