Counting by twos is sometimes called "skip counting" because every other number or count is skipped.
Each count is two more than the previous count.
The table illustrates counting by twos.
1
2
3
4
5
6
7
8
9
10
11
12
If you counted by twos and started with 1 then the blue boxes would
have the counts (1, 3, 5, 7, 9, 11)
If you counted by two's and started with two then the white boxes would
have the counts (2, 4, 6, 8, 10, 12).
What is the Next Number if Counting Up by Twos?
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