As kids put together our skill-building sun puzzles, they boost addition fluency with missing addends—in a concrete, visual way! Each self-correcting puzzle features a number from 1 to 17, plus 5 equation pieces that each show a number sentence with a missing addend. Kids just match the number in the sun’s center to the corresponding equations—developing addition fluency with instant reinforcement! Set includes 17 puzzles divided into 4 skill levels that gradually progress in difficulty

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