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Practice sheet with Answers
https://www.commoncoresheets.com/Math/Addition/Within%201000/English/1.pdf

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Multiple Games to practice Rounding
https://www.sheppardsoftware.com/mathgames/menus/roundestimate.htm

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Practice sheet with Answers
https://www.commoncoresheets.com/Math/Subtraction/Subtraction%20(Vertical)/English/1.pdf

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Tutorial for Addition and Subtraction with Regrouping

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Tutorial for Addition and Subtraction with Regrouping

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https://www.khanacademy.org/math/arithmetic/arith-review-add-subtract/arith-review-add-within-100a/v/adding-two-digit-numbers-without-regrouping

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Online Game
https://www.mathgames.com/skill/3.31-increasing-addition-patterns

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https://learnzillion.com/lesson_plans/5139-find-benchmark-numbers-using-a-number-line/

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Post question or a need for additional review resources.

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Post question or a need for additional review resources.

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Rap Video:
https://youtu.be/pNfz-JU2cKE

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Practice word problems and answer sheet.

https://www.commoncoresheets.com/Math/Multistep/Add-Sub%20E/English/1.pdf

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Online Game
https://www.mathgames.com/skill/3.36-increasing-subtraction-patterns

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Video:
https://youtu.be/CMdck80SHnw