The strategy that Mrs. Tran is explaining is called compensation. This strategy involves adjusting the numbers to make the computation easier, while maintaining the same overall sum. In this case, knowing that 5 + 10 = 15 can help in figuring out 7 + 8, as you can adjust the numbers (e.g., thinking of 7 as 5 + 2 and 8 as 10 - 2).
Mrs. Tran has just explained a new strategy for figuring out unknown addition problems. She tells the students that if they know the sum of 5+10, they can easily figure out the sum 7+8. This strategy is called
one more or one less than a known fact, counting back, counting on, or compensation?
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