1. Lesson 8: Rounding Numbers
October

2. Let’s Get Set!!
Look at your number line. Place the red chip on the number line between the correct numbers.

3. Vocabulary
Round = to approximate the value of a number by finding the nearest ten, hundred, or other place value
To Estimate = to give an approximate number
An Estimate = a close guess made using mathematical thinking

4. Let’s review Place Value
thousands
hundreds
tens
ones

5. SO….. 384 is between ______ & ______
Watch Me!!!
Look at the number Between which two tens does it fall? Between which two hundreds does it fall?
1. Including the hundreds, how many tens are there? _____
2. What is the next greatest number of tens? ____
How do you write these numbers as numerals? _________
How many hundreds are there? ____
5. What is the next greatest number of hundreds? _____
6. How do you write these numbers as numerals? _____
SO… is between ______ & ______
Hundreds
Tens
Ones

6. Remember This

7. Watch Me!!!!
When you round a number, you are finding a number that is close to that number. This makes numbers easier to work with. A number line can help you round.
Round the numbers 8, 14, 5
Round the numbers 25, 175, 50

8. Do You Understand? Let’s Check!!!
Let’s round these numbers. Remember….look to the right!!! 53
285 8
194 78

9. Let’s Practice With a partner…..
What is 145 rounded to the nearest ten?
What is 145 rounded to the nearest hundred?
Explain how you found your answers.

10. Independent Time
What 10’s are these numbers in between? Circle the one it’s closest to. 72 25 13
183 4
What 100’s are these numbers in between? Circle the one it’s closest to.
328
758 59 7
937

11. Let’s Wrap it Up!

12. Show Me What You Learned!
Students raised $515 for a class trip. How much did the students raise rounded to the nearest ten and the nearest hundred?
Nearest 10 = ______
Nearest 100 = _____