Lesson 8: Rounding Numbers

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Presentation transcript:

Lesson 8: Rounding Numbers October 9 - 13

Let’s Get Set!!

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

Let’s use a hundreds chart!!! Watch Me!!! Ally records the time she spends doing homework. She rounds each time to the nearest ten minutes. Ally spends 37 minutes on her homework. How does she record this time? Let’s use a hundreds chart!!!

Remember This

Round 943 to the nearest ten. Partner Talk Round 943 to the nearest ten. 943 is between what two tens? __________________ What number is halfway between these two tens? ________ Is 943 less than or greater than the halfway number? _________ Do you round 943 up or down? _______ What is 943 rounded to the nearest ten? ________

Do You Understand? Let’s Check!!! True or False????? 1. 73 rounded to the nearest ten is 80 135 rounded to the nearest ten is 140 83 rounded to the nearest hundred is 100 382 rounded to the nearest ten is 400 45 rounded to the nearest ten is 50 274 rounded to the nearest ten is 270

Let’s Practice

Independent Time Round to the nearest ten. What is a number less than 180 that rounds to 180? What is a number greater than 180 that rounds to 180?

Let’s Wrap it Up!

Show Me What You Learned! Which numbers are rounded correctly? Choose ALL of the correct answers. 444 rounded to the nearest ten is 440. 361 rounded to the nearest hundred is 400. 547 rounded to the nearest hundred is 500. 255 rounded to the nearest ten is 250. 625 rounded to the nearest hundred is 630.