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estimating and rounding offClear All
Curated OER
How Much Is On The Floor?
Students estimate the number of items in a group. In this estimation lesson, students are presented with random objects to clean up. Students estimate how many items are present and then compare the actual number of items to their...
Curated OER
High School Mathematics Problems from Alaska: Cigarette Smoking
High schoolers analyze the monetary cost associated with smoking. Students use statistics to determine life expectancy and cost associated with smoking.
Curated OER
Our World A Complex Eco-system
Sixth graders set up an ecosystem, investigate conservation techniques, develop an action plan for conservation, and various other activities to explore the ecosystem.
Curated OER
Jobs and Salaries
In this economics worksheet, students look for the budgets and go through the practical activities of maintaining a monthly expense sheet.
PBS
Pbs Learning Media: Rounding: Cyberchase Games
In this interactive activity, discover how rounding off numbers helps you estimate faster.
Illustrative Mathematics
Illustrative Mathematics: 3.nbt, 4.nbt Rounding to the Nearest 100 and 1000
This task builds off of the skill of rounding to the nearest ten and hundred in third grade. Aligns with CCSS.Math.Content.3.NBT.A.1 Use place value understanding to round whole numbers to the nearest 10 or 100.
University of California
University of Calilfornia: Significant Figures Ii
This site from the University of California provides a lengthy and intelligent discussion of sig figs, absolute and relative precision, accuracy, precision in calculations, rounding off, and the whole shooting match of how we report what...
Simon Fraser University
Chem1 Virtual Textbook: Significant Figures and Rounding Off
As part of a larger site called "Getting started in Chemistry," this site examines significant figures and claims to teach the user "how to avoid telling lies with numbers."
BBC
Bb Ci: Review Significant Digits
BBCi presents a test prep review ("revision") section on significant digits and on approximating an answer by rounding in order to work with an easy number. Click on "Test Bite," on the last page to get an interactive quiz.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: The Meaning of Multiplication: Mental Calculation
If you are looking for a website that explains and defines the basics of mental multiplication with helpful hints then you have arrived at an excellent resource. There are even practice problems at the very end of the lesson.
Other
Tlsbooks.com: Printable Math Worksheets
You may print off addition, subtraction, multiplication, division, averages, fraction, and other miscellaneous worksheets that are related to mathematics. On the left hand side of this page you will also find links to other subjects,...
CK-12 Foundation
Ck 12: Arithmetic: Product Estimation With Mixed Numbers/fractions
[Free Registration/Login may be required to access all resource tools.] Estimate products and quotients of fractions and mixed numbers.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: The Meaning of Subtraction, and Mental Calculation
This website explains and defines basic subtraction. There are practice problems at the very end of this lesson.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: Table of Contents
This website from The Math Page explains some helpful hints about how to do mental math.