compensation - a strategy that involves adjusting one addend to the next tens or hundreds, then adjusting the other addend to keep the balance, addend - any number being added, bundling - putting smaller units together to make a larger one; also called composing, difference - the answer to a subtraction problem, equation - a number sentence with an equal sign, the amount on one side of the equal sign has the same value as the amount on the other side, number bond - a model that shows the part-part-whole relationship of numbers, place value - the value of a digit based on its position in a number, subtraction - to take away, remove, or compare, How many, total, altogether - key words for addition, how many more, left, difference - key words for subtraction,

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