You can count by twos.
Adding 2 to the previous number is possible.
You have to count and skip every other number.
If you started with 0 and counted by twos, the numbers that you would count would be:
0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and so on.
All of the counts are the same.
If you started with 1 and counted by twos, the numbers that you would count would be:
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31 and so on.
All of the counts are odd numbers.
Let's begin with a practical exercise involving counting in twos.
For more help and advice with Maths watch this video.