Quia
Quia: Hangman Rounding
Don't get "hung up" when you play this old game with a new twist. Simply, round each numbers to the nearest thousand then, find the sum or difference. Knowledge of place value units, where to put the comma, and good computation skills...
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.
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...
AAA Math
Aaa Math: Addition Using Estimation
This site explains how to estimate sums by rounding whole numbers. Games and exercises are provided to practice the skill.
Study Pad
Splash Learn: Add Decimals Using Models
[Free Registration/Login Required] This fun decimal addition worksheet introduces students to the world of operations with decimal numbers. Fifth graders use models to visualize the addition of numbers in the tenths and hundredths places...
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.
Teaching Treasures Publications
Teaching Treasures: Year Six Math (Page 2)
This interactive worksheet covers a wide range of math concepts such as Roman Numerals, distributive property, estimating sums, and comparing fractions and decimals. Some concepts may be slightly challenging. Learners can access the help...
Khan Academy
Khan Academy: Probabilities in Genetics
Article reviews some probability basics then investigates how these calculations can be applied to genetics problems involving relatively large numbers of genes. Explores how the sum rule and the product rule can be used to solve these...
Quia
Quia: Math Journey
In this online game London is your starting place! This game lets you practice addition, subtraction, multiplication, division and rounding as you "Travel," around the world. You can also choose the level of difficulty
CK-12 Foundation
Ck 12: Arithmetic: Decimal Addition
[Free Registration/Login may be required to access all resource tools.] Add decimals with and without rounding
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: 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.
AAA Math
Aaa Math: Front End Estimation
Front-end estimation is explained and demonstrated with an online game at this AAA Math lesson.
Mangahigh
Mangahigh: Number: Estimation
Estimate the sum and difference by rounding whole numbers and decimals.
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.
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
Math Aids
Math Aids: Estimation Worksheets
Great resource to practice and strengthen math skills pertaining to estimation. Math worksheets are printable, may be customized, and include answer keys.
Wolfram Research
Wolfram Math World: Power Series
This site gives many different summation formulas and their expansions. Very Comprehensive site
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.
CK-12 Foundation
Ck 12: Arithmetic: Decimals
[Free Registration/Login may be required to access all resource tools.] Use number properties in decimal operations
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