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

Answer 1

Mrs. Tran's strategy is likely referring to the concept of "number relationships" or "number bonds." Specifically, it could be an example of using "known sums" or "related facts" to solve addition problems. In this case, students can use their knowledge of the sum 5 + 10 = 15 to help them calculate 7 + 8 by recognizing that both problems can be approached with a similar additive reasoning. This strategy encourages students to use foundational knowledge to derive answers to other related problems.