Frequency All Fours: 101 Math Puzzles To Train Your Brain
Sharpen your brain with new number logic puzzles! Your addition and pattern-recognition skills will be put to the test as you work through 100 4x4 puzzle grids plus a BONUS 5x5 puzzle, ranging in difficulty from Learner to Teacher. Each handmade puzzle has one unique solution that can be solved from only the given clues. For casual or beginner puzzlers, Frequency All Fours is the perfect place to start.
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