1. Rounding Whole Numbers
Lesson 3-5
CCSS 4.NBT.3
Literature Link: Great Estimations by Bruce Goldstone

2. MATH Essential Questions
What kind of experiences help develop number sense?
MATH
Essential
Questions

3. MATH Essential Questions
How can we estimate numbers?
MATH
Essential
Questions

4. Warm Up
Write the following numbers in expanded form.
47,902
348,729
201,565

5. When is rounding numbers helpful?
Think and Write
When is rounding numbers helpful?

6. Vocabulary
Estimate: To replace the exact number with the number that tells about how many to the closest ten or hundred. “Round” is another word for estimate.

7. Rounding numbers
When rounding a number, always look to the digit to the right of the place you are rounding to.
If the number in the place is 4 or lower, round DOWN.
If the number in the place is 5 or higher, round UP.

8. Rounding Song

9. Rounding Practice
Round each number to the nearest ten and hundred.
45,678
3,212
19,753
213,908

10. Rounding Practice!
Round each number to the place of the underlined digit.
361,204
809,143
922,876
187,863

11. Problem 1 Animal Number in Wild Leatherback Turtle 59,984 Giant Panda
Round the number of each type of endangered animal in the wild to the nearest thousand.
Animal
Number in Wild
Leatherback Turtle
59,984
Giant Panda
1,132
Gorilla
125,121
White Rhino
19,814
Elephant
356,792

12. Problem 2
Melissa sold 2,132 raffle tickets. Hayla sold 9,983 raffle tickets. Giana sold 3,521 raffle tickets. Round each number to the nearest thousand to estimate how many tickets were sold altogether.

13. Wrap UP
In this lesson, you learned how to use place value to round numbers through the hundred thousands. .
For homework, 3-5 Practice if you are comfortable with rounding. If you want more practice, try 3-5 Reteaching.
Website for Practice: