When you count by 4s, each new number is 4 more than the one before it. This means the numbers in the sequence are multiples of 4.
Start with the given number and add 4 each time:
If a number is missing, ask: What is 4 more than the last number I see?
Move through the sequence in order and keep adding 4. Do not skip any step, because each term depends on the one before it.
Example:
Read the sequence again and make sure:
If one jump is not 4, go back and correct that spot.
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