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The pattern given is: 1, 5, 9, 13, ?

Let's examine the differences between the numbers:

- 5 - 1 = 4
- 9 - 5 = 4
- 13 - 9 = 4

So, the pattern increases by 4 each time. The next number should be:

13 + 4 = 17

Therefore, the correct answer is **17**.

Would you like more details or have any other questions?

Here are 5 related questions to expand on this:

1. What would be the next number in the sequence after 17?
2. Can you identify another number pattern that increases by a constant difference?
3. How do arithmetic sequences differ from geometric sequences?
4. What is the formula to find the nth term of an arithmetic sequence?
5. Can you find a sequence where the difference between numbers is not constant?

**Tip:** When identifying number patterns, check if the differences between terms are constant. This often indicates an arithmetic sequence.

Which number best completes the pattern 1, 5, 9, 13, ?

Learn how to identify the next number in an arithmetic sequence: 1, 5, 9, 13, ? Understand the pattern, apply the arithmetic sequence formula, and solve for the missing number. Ideal for students in Grades 5-7.

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