A teacher puts 20 pennies in a shoebox. A student shakes the box, takes the lid off, and sorts the coins into two groups: heads and tails. The students count the number of heads and the number of tails and record the numbers in a table. The activity is repeated 20 times. Which of the following does the activity help the students explore?
A. The counting principle
B. One-to-one correspondence
C. Addition and subtraction as inverse operations
D. Separating and joining as a way to represent addition
Ans: D. Separating and joining as a way to represent addition
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