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800

800. 300. Rounding. To the nearest 100. 700. 100. Chris Clements. Learning Objective:. <date>. <Steps to success>. Rounding. Rounding. Rounding. Rounding. Rounding is used to approximate or estimate. In this lesson we are looking at rounding numbers to the nearest 100. 2. 7. 3.

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800

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  1. 800 300 Rounding To the nearest 100 700 100 Chris Clements

  2. Learning Objective: <date> <Steps to success>

  3. Rounding Rounding Rounding Rounding Rounding is used to approximate or estimate. In this lesson we are looking at rounding numbers to the nearest 100.

  4. 2 7 3 0 4 2 2 4 2 0 Rounding whole numbers Rounding whole numbers Can you remember how to round numbers to the nearest 10? Identify the units digit. If the units digit is a 1, 2, 3 or 4 we round down. If the units digit is a 5, 6, 7, 8, or 9 we round up.

  5. There is a similar pattern for rounding numbers to the nearest100 • Identify the tens digit. 3 3 3 9 2 5 5 7 7 2 2 8 9 . 5 8 8 1 continued

  6. continued Onto the next step. 2) If the tens digit is a 0, 1, 2, 3 or 4 we round down to the nearest 100. 500 600 5 4 4 0 Is it closer to 500 or 600? 5 0 0 round down 400 500 4 2 3 2 Is it closer to 400 or 500? 4 0 0 round down Can you see that the units digit is not important when rounding numbers to 100? continued

  7. continued Onto the final step. 3) If the tens digit is a 5, 6, 7, 8 or a 9 round up to the next hundred. 600 500 5 5 5 0 6 0 0 Is it closer to 500 or 600? round up 600 700 6 8 8 3 Is it closer to 600 or 700? 7 0 0 round up Remember if a number ends in -50, although it is exactly halfway between the two hundred values we still round up! continued

  8. Lets have ago at rounding to the nearest 100. 300 400 3 4 2 2 Is it closer to 300 or 400? 3 0 0 round down 600 700 6 5 8 5 Is it closer to 600 or 700? 7 0 0 round up 700 800 0 7 0 3 7 Is it closer to 700 or 800? 0 0 round down continued

  9. And more… 100 200 1 4 9 4 Is it closer to 100 or 200? 1 0 0 round down 800 900 8 8 8 8 Is it closer to 800 or 900? 9 0 0 round up 900 1000 5 9 5 1 Is it closer to 900 or 1000? 1 0 0 0 round up

  10. Now without the number line! 4 7 7 9 5 0 0 2 0 0 2 1 1 7 9 0 0 6 8 6 1 continued

  11. Last three… 2 4 4 9 2 0 0 6 0 0 5 7 7 8 9 0 0 9 0 0 9 continued

  12. Activity <type here>

  13. Learning Objective: <date> Steps to success • Identify the tens digit. 2) If the tens digit is a 0,1, 2, 3 or 4 we round down to the nearest 100. 3) If the tens digit is a 5, 6, 7, 8 or a 9 round up to the next hundred.

  14. Choose 2 cards that when added together round to 500. Plenary Match these numbers to the nearest 100. 490 428 700 342 100 712 400 51 300 170 and 320 = 490 170 420 320 390 How do you round numbers to the nearest thousand (1000)?

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