It is Approximately...
There are two types of estimation strategies.
1. Computational Estimation Strategies deal with addition, subtraction, division and multiplication of numbers...computation of numbers.
a. Front-end and adjusting-Estimating using the first digit of the number
b. Clustering around an average- Multiply the average by the total number of numbers.
For example: There are 5 numbers in a list. The average of the numbers is 20. You can multiply 20 X 5 and estimate the sum of the numbers to be 100.
c. Rounding and adjusting- Round numbers up or down
d. Finding compatible numbers such as factors- find sums or products that make groups of 10.
2. Perceptual Estimation Strategies deal with looking at something and estimating how many there are.
a. Comparing an unknown quantity to a known quantity.
For example, you know what a cup of water looks like, so can estimate a cup of liquid.
b. Partitioning into known quantities-When you know what a small portion looks like, you can estimate how many are in a larger group.
Example: knowing what fifty pennies looks like helps you to estimate the number of pennies in a jar.
1. Computational Estimation Strategies deal with addition, subtraction, division and multiplication of numbers...computation of numbers.
a. Front-end and adjusting-Estimating using the first digit of the number
b. Clustering around an average- Multiply the average by the total number of numbers.
For example: There are 5 numbers in a list. The average of the numbers is 20. You can multiply 20 X 5 and estimate the sum of the numbers to be 100.
c. Rounding and adjusting- Round numbers up or down
d. Finding compatible numbers such as factors- find sums or products that make groups of 10.
2. Perceptual Estimation Strategies deal with looking at something and estimating how many there are.
a. Comparing an unknown quantity to a known quantity.
For example, you know what a cup of water looks like, so can estimate a cup of liquid.
b. Partitioning into known quantities-When you know what a small portion looks like, you can estimate how many are in a larger group.
Example: knowing what fifty pennies looks like helps you to estimate the number of pennies in a jar.
Wonderful Picture Books
Click on the books to link to external websites with book reviews and/or blurbs! Please not the disclaimer: Because the world wide web is live and not static, I am not responsible for the content on website links. I have carefully analyzed each link, however, I cannot control which adds pop up or whether the owner of the website changes the content.
|
|
|
|
|
|
|
Please see the disclaimer
|
Date Created: November 2013
Updated: November 2013 |
