Exam question
You count a row of cups and say “one, two, three, four.” What does “four” tell you?
The last counting word names the size of the whole set (cardinality).
Exam question
If two sets can be paired one-to-one with nothing left over, they have the same count.
Equal counts means a perfect matching exists between the members of each set.
Exam question
A shelf has three books. You add two more without removing any. How many books are on the shelf now?
Example: 5 · integer
3 + 2 = 5. Enter the integer 5 (not 5.0).
Exam question
What is 9 + 5?
9 + 5 = 14.