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621. 995. Rounding. Up or down?. Up to 1000. 132. Chris Clements. <date>. Learning Objective:. <Steps to success>. Rounding. Rounding is used to approximate or estimate. Rounding is used to approximate or estimate. Rounding is used to approximate or estimate.

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995

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  1. 621 995 Rounding Up or down? Up to 1000 132 Chris Clements

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

  3. Rounding Rounding is used to approximate or estimate. Rounding is used to approximate or estimate. Rounding is used to approximate or estimate. Numbers can be rounded either up or down Sometimes an exact number is not always required. See the following examples;

  4. Rounding The number of people who went to see William and Kate after they got married could be rounded to the nearest thousand (1000). The number of sandwiches needed to be made for a party may be rounded to the nearest ten (10).

  5. Rounding The number of nails in a box may be rounded to the nearest 100. The time it takes a car to get to a destination may be rounded to the nearest minute.

  6. Step 1 in the steps to success • Identify the units digit 5 2 2 7 4 9 9 2 4 6 4 5 5 8 8 3 7 4 4 4 4 3 3 continued

  7. Take a look at these number lines. 126 120 121 122 123 124 125 127 128 129 130 If a number ends in a 5, 6, 7, 8 or 9 round up So 125, 126, 127, 128 and 129 round up 200 201 202 203 204 205 206 207 208 209 300 If a number ends in a 1, 2, 3 and 4 round down So 201, 202, 203 and 204 round down continued

  8. Now for the next 2 steps to success. Do you think you know them? 2) Numbers that end with a 5, 6, 7, 8 or 9 round up 3) Numbers that end with a 1, 2, 3 or 4 round down 1 2 3 4 5 6 7 8 9 round up round down continued

  9. Can you see if these numbers need to be rounded up or down. 230 240 Is it closer to 230 or 240? 2 3 3 3 Does it end in a 1, 2, 3 or 4? ROUND DOWN! 380 390 Does it end in a 5, 6, 7, 8 or 9? Is it closer to 380 or 390? 3 8 5 5 ROUND UP! continued

  10. 2 5 8 8 round up 7 8 3 3 round down 6 5 5 5 round up 9 5 4 4 round down continued

  11. 3 7 1 8 2 2 6 9 9 2 2 5 Do these numbers; Round up Round down continued

  12. Rounding up or down Steps to success • When rounding up or down there are three main things to remember; • 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. continued

  13. Activity <type here>

  14. Plenary 164 Find the number closest to 160; 151, 164, 166, 154 Find the number closest to 420; 411, 426, 414, 415 415 Which of these numbers give 80 when rounded to the nearest 10? 75 and 83 74, 83, 75 and 86 Which of these numbers give  190 when rounded to the nearest 10? 191, 186 and 193 191, 184, 186 and 193

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