This reasoning strategy is commonly used in high performing countries and takes advantage of student's knowledge of combinations. Identify the equation that represents this strategy
A) 15 - 8, think 10 + 5 - 8, take from the 10: 10 - 8, add back on the 5 to get the answer.
B) 14 - 8, take away 4 to get to 10, then take away 4 more to get the answer.
C) 12 - 5, it takes 5 to get to 10 and 2 more to 12 and 5 + 2 = to get to the answer.
D) 7 + 6, 5 + 2 is seven and 6 is 5 + 1, add 5 + 5 and add the 2 and 1 to get the answer.
Answer: A
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