CK-12 Foundation
Ck 12: Arithmetic: Decimal Rounding to Estimate Sums and Differences
[Free Registration/Login may be required to access all resource tools.] Estimate sums and differences by rounding decimals to whole numbers.
Fact Monster
Fact Monster: Rounding Numbers
The lesson explores how to round numbers. Explanations and examples are included in the tutorial.
Texas Instruments
Texas Instruments: Estimating With Rational Numbers
In this activity, students will round fractions and mixed numbers, and then use their rounding skills to estimate sums, differences, products, and quotients.
CK-12 Foundation
Ck 12: Arithmetic: Estimation of Whole Number
[Free Registration/Login may be required to access all resource tools.] Round whole numbers in order to estimate sums and differences.
AAA Math
Aaa Math: Estimating a Sum
Students can practice estimating sums to the nearest thousand in a series of self-check exercises and timed learning games.
AAA Math
Aaa Math: Estimating a Sum by Rounding
Use rounding to estimate the answer to an addition problem in this online game. As you play the game, running totals of correct and incorrect answers and your score are displayed.
AAA Math
Aaa Math: Estimating a Sum by Rounding
This site explains how to estimate sums of whole numbers. Gives practice and games to practice this skill.
CK-12 Foundation
Ck 12: Arithmetic: Mixed Number and Fraction Estimation
[Free Registration/Login may be required to access all resource tools.] Round fractions and mixed numbers in order to estimate sums and differences.
McGraw Hill
Glencoe: Self Check Quizzes 1 Estimating Fraction Sums and Differences
Use Glencoe's randomly generated self-checking quiz to test your knowledge of estimating sums and differences. Each question has a "Hint" link to help. Choose the correct answer for each problem. At the bottom of the page click the...
ClassFlow
Class Flow: Estimating Sums and Differences
[Free Registration/Login Required] This flipchart is designed to teach third grade students the steps in estimating sums and differences. It also reviews rounding numbers to the nearest ten and hundred.
CK-12 Foundation
Ck 12: Arithmetic: Decimal Addition Using Front End Estimation
[Free Registration/Login may be required to access all resource tools.] Use front-end estimation to estimate decimal sums
NumberNut
Number Nut: Estimate and Round Why Is This Important?
Problem solving will become a little easier when you understand the concepts of estimation and rounding. Explore how these concepts are used in mathematics and real world applications. Detailed examples and links to related games...
CK-12 Foundation
Ck 12: Arithmetic: Decimal Subtraction
[Free Registration/Login may be required to access all resource tools.] Subtracting decimals with and without rounding
CK-12 Foundation
Ck 12: Arithmetic: Front End Estimation Grade 6
[Free Registration/Login may be required to access all resource tools.] Estimate sums and differences of decimals using front-end estimation.
AAA Math
Aaa Math: Estimation
Improve your estimation and rounding skills with these interactive games that are challenging and fun. Excellent skills practice for rounding, estimating sums and differences, and front-end estimation. Links to lesson plans, teacher...
CK-12 Foundation
Ck 12: Arithmetic: Decimals
[Free Registration/Login may be required to access all resource tools.] Use number properties in decimal operations