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Orange Group

Use the number ine to help you estimate your subtraction problems.

http://www.mathsisfun.com/numbers/estimation-game.php

# data[].attributes.attachment_link.description
Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

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Blue Group

Play Pac Man to estimate the subtraction problems.

https://www.sheppardsoftware.com/mathgames/round/mathman_round_subtraction.htm

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Mathman - Estimate Differences By Rounding

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Estimate differences By rounding the fun way with this pac man style math game.

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Green Group

Use the number line to help you estamte your subtraction problems

http://www.mathsisfun.com/numbers/estimation-game.php

# data[].attributes.attachment_link.description
Math explained in easy language, plus puzzles, games, quizzes, worksheets and a forum. For K-12 kids, teachers and parents.

# data[].attributes.body
Blue Group

Word Problems using Estimation

http://www.softschools.com/quizzes/math/estimation_word_problems/quiz2066.html

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Orange Group

Estimation with Subtraction/Differences

http://www.sheppardsoftware.com/mathgames/round/mathman_round_subtraction.htm

# data[].attributes.attachment_link.title
Mathman - Estimate Differences By Rounding

# data[].attributes.attachment_link.description
Estimate differences By rounding the fun way with this pac man style math game.