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Estimation!!

Estimation. Estimation!!. ► Today we are going to expand our knowledge of rounding numbers to estimation!. How many Skittles are in the jar?. First jar= 10 Middle jar= ??????? Last jar= 100. What is Estimation?. Educated guess or prediction of the answer. Why do we estimate?.

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Estimation!!

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  1. Estimation Estimation!! ►Today we are going to expand our knowledge of rounding numbers to estimation!

  2. How many Skittles are in the jar? • First jar= 10 • Middle jar= ??????? • Last jar= 100

  3. What is Estimation? • Educated guess or prediction of the answer

  4. Why do we estimate? • Wouldn't it be great if you could quickly guess how many people were in a room, how many cars in the street, how many boxes on the shelf, or even how many seagulls on the beach? • We are not talking exact answers here, but answers that are good enough for your life. • THIS IS ESTIMATING!

  5. How do you ROUND a number? • Look for place value. (Position in which a digit is in the number) • Five or more, Raise the Score! • Four or less, Let it Rest!

  6. Characteristics: Estimation 5-9 round up ↑ 0-4 round down ↓

  7. Let’s Try It!-Do we round up or down? (Round to the nearest 10) • 2 ↓ 0 • 18 ↓ 20 • 45 ↓ 50 • 167 ↓ 170 • Remember!! • Five or more raise the score. • Four or less let it rest

  8. Process: 5,629 • Round to the nearest 100!! • 1) Circle the digit your rounding to. 5, 29 • 2) Underline the digit to the right. 5,629 • 3) If the underlined number is 5 or more raise the score (circle goes up 1) 4 or less let it rest (circle goes down to 0) • 4) Use 0 as a place holder 5,600 6

  9. Example: 562 and 278 • Nearest to 10! 5 2→ 560 2 8→280 • Circle number and underline number to the right 562+278= ↓ ↓ 560+280= 560 +280 840 Answer 6 7

  10. OUR CONCEPT MAP Definition: Example: Characteristics: Why do we use it? Estimation

  11. Would anyone like to share???

  12. OUR CONCEPT MAP Definition: Example: • Educated guess or 23→ 20 (Round to nearest 10) prediction of the answer 156→ 200 (Round to nearest 100) Characteristics: Why do we use it? • 5-9 round up ↑ To make a quick guess. • 0-4 round down ↓ I like to estimate when I’m shopping, that way I can keep a total of how much I can spend. Estimation

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