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Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.

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This website offers an interactive addition chart. You can choose a 0-9, 1-10, or 1-12 chart. This allows students to review their addition facts up to 12. This website also allows students to select a color to fill in a number. For example so they can remember that 7+7 is 14.
https://www.mathplayground.com/interactive_addition_chart.html

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This website offers fun interactive math games. One game the students can play is "Save The Whale." In this game students review the different numbers that can add up to 10. (bonds of 10) This allows students to start thinking about if they want 10 of something and only have 3, they need 8 more.
http://www.ictgames.com/save_the_whale_v4.html

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This website offers an interactive math game called "Marble Math." This game allows students to use marbles as manipulatives to guide them in finding the solution. This game offers multiple rounds to the student so they can keep solving more complex problems.
http://www.abcya.com/addition.htm

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This website offers an interactive math game. This game is called "inverse operations quiz." It gives you a problem where you have to find the missing number. The student has to choose 1 of the 4 options that will help them correctly solve the problem. For example, the question ask 2+ __= 11. The student would select 11-2=9 because that is how they would find the missing number 9.
https://www.education.com/game/inverse-operations-quiz/

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This website offers an interactive math game that allows the student to fill in the missing number. Instead of reviewing 1+5=6, the student has to figure out how they can solve the problem, and then type in the correct missing number. For example, 1+__=6. The student will evaluate the problem and know that 6-1=5 and then they will type in the missing number 5.
https://www.mathgames.com/skill/1.46-complete-the-equation-with-sums-up-to-20