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Mental addition worksheet with challenging math problems and a cartoon character.

A worksheet titled "Very hard mental addition" with math problems involving addition, including fill-in-the-blank equations and word problems, featuring a cartoon character and the "iBrain" logo.

A worksheet titled "Very hard mental addition" with math problems involving addition, including fill-in-the-blank equations and word problems, featuring a cartoon character and the "iBrain" logo.

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