Lesson 8: Rounding Numbers October 9 - 13

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

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

Let’s review Place Value thousands hundreds tens ones

SO….. 384 is between ______ & ______ Watch Me!!! Look at the number 384. 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….. 384 is between ______ & ______ Hundreds Tens Ones

Remember This

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

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

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.

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

Let’s Wrap it Up!

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 = _____