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Art of Problem Solving Beast Academy 1B Guide and Practice $27 : Addition: Symbols (+ and =), writing addition, finding a missing addend, pairs with the same sum (number bonds), adding more than two numbers, making ten, order (commutativity), and counting up. Subtraction: Taking away, subtracting 10, counting down, the relationship between addition and subtraction, finding a difference, ordering, and strategies. Categories: Properties, finding similarities and differences, which doesn't belong, categories of numbers (odds, evens, squares, and primes), Venn diagrams.

Art of Problem Solving Beast Academy 1B Guide and Practice