Question

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?

Answer 1

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).