estimating decimals n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Estimating Decimals PowerPoint Presentation
Download Presentation
Estimating Decimals

Loading in 2 Seconds...

play fullscreen
1 / 24

Estimating Decimals - PowerPoint PPT Presentation


  • 267 Views
  • Uploaded on

Estimating Decimals. EQ: How can I use estimation techniques? MA.6.A.3.5. Estimating Decimals. Clustering. What is clustering ?. Clustering. What is clustering ? A method used to estimate a sum or product when all the numbers are close to the same value.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Estimating Decimals' - nico


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
estimating decimals

Estimating Decimals

EQ: How can I use estimation techniques?

MA.6.A.3.5

clustering
Clustering
  • What is clustering?
clustering1
Clustering
  • What is clustering?

A method used to estimate a sum or product when all the numbers are close to the same value.

  • When would you use clustering to estimate the solution to a problem involving decimals?
clustering2
Clustering
  • What is clustering?

A method used to estimate a sum or product when all the numbers are close to the same value.

  • When would you use clustering to estimate the solution to a problem involving decimals?

When all the numbers are close to each other.

clustering3
Clustering
  • Nancy wants to cycle, ice skate, and water ski for 30 minutes each. About how many calories will she burn in all? (Cycling – 165.5 calories, ice skating – 177.5 calories, and water skiing – 171.5 calories.)
  • In this example, what number could represent all of the calories?
clustering4
Clustering
  • Nancy wants to cycle, ice skate, and water ski for 30 minutes each. About how many calories will she burn in all? (Cycling – 165.5 calories, ice skating – 177.5 calories, and water skiing – 171.5 calories.)
  • In this example, what number could represent all of the calories? 170
clustering5
Clustering
  • Nancy wants to cycle, ice skate, and water ski for 30 minutes each. About how many calories will she burn in all? (Cycling – 165.5 calories, ice skating – 177.5 calories, and water skiing – 171.5 calories.)
  • In this example, what number could represent all of the calories? 170
clustering6
Clustering
  • Nancy wants to cycle, ice skate, and water ski for 30 minutes each. About how many calories will she burn in all? (Cycling – 165.5 calories, ice skating – 177.5 calories, and water skiing – 171.5 calories.)
  • What operation could you use rather than adding 170 plus 170 plus 170?
clustering7
Clustering
  • Nancy wants to cycle, ice skate, and water ski for 30 minutes each. About how many calories will she burn in all? (Cycling – 165.5 calories, ice skating – 177.5 calories, and water skiing – 171.5 calories.)
  • What operation could you use rather than adding 170 plus 170 plus 170?

Multiplication

rounding
Rounding
  • When rounding a decimal, how do you know which digit to look at?
rounding1
Rounding
  • When rounding a decimal, how do you know which digit to look at?

0. 375

1000

Place a 1 under the decimal and a 0 under each value past the decimal.

Read the whole number and the “spit” number

rounding2
Rounding
  • Explain the rules for rounding a decimal.
rounding3
Rounding
  • Explain the rules for rounding a decimal.
    • Underline the specified place value.
rounding4
Rounding
  • Explain the rules for rounding a decimal.
    • Underline the specified place value.
    • Look to the right of the underlined value.
rounding5
Rounding
  • Explain the rules for rounding a decimal.
    • Underline the specified place value.
    • Look to the right of the underlined value.
    • 5 or more “raise the score” or 4 or less

“let it rest”

rounding6
Rounding
  • If you rounded all the numbers “up”, how would your estimated answer compare to the actual answer to the problem?
rounding7
Rounding
  • If you rounded all the numbers “up”, how would your estimated answer compare to the actual answer to the problem?

If all the numbers were rounded up, the estimated answer would be an

over-estimate

compatible numbers
Compatible Numbers
  • What are compatiblenumbers?
  • Given the expression 33.83 · 1.98, how does the estimated product compare to the actual product? Explain.
  • Given the expression 72.77 ÷ 26.14, why would you choose not to round the numbers to 73 and 26?
  • What would you use?
compatible numbers1
Compatible Numbers
  • What are compatiblenumbers?

Numbers that are close to the given

numbers that make estimation or

mental math easier.

compatible numbers2
Compatible Numbers
  • Given the expression 33.83 · 1.98, how does the estimated product compare to the actual product? Explain.
compatible numbers3
Compatible Numbers
  • Given the expression 72.77 ÷ 26.14, why would you choose not to round the numbers to 73 and 26?
compatible numbers4
Compatible Numbers
  • Given the expression 72.77 ÷ 26.14, why would you choose not to round the numbers to 73 and 26?
  • What would you use?