Find the Missing Numbers: Complete the Sequence __, 13899, __

Number Sequences with Consecutive Integers

Complete the previous and following number:

,13899, \Box,13899,\Box

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Step-by-step written solution

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1

Understand the problem

Complete the previous and following number:

,13899, \Box,13899,\Box

2

Step-by-step solution

To solve this problem, we will find the numbers immediately before and after 13,899:

  • Step 1: Calculate the predecessor by subtracting 1 from 13,899.
  • Step 2: Calculate the successor by adding 1 to 13,899.

Let's perform these calculations:

Step 1: Predecessor is 13,8991=13,898 13,899 - 1 = 13,898 . Therefore, the number before 13,899 is 13,898.

Step 2: Successor is 13,899+1=13,900 13,899 + 1 = 13,900 . Therefore, the number after 13,899 is 13,900.

Thus, the complete sequence is 13,898,13,899,13,900 13,898, 13,899, 13,900 .

The correct answer is choice 1: 13898,13900 13898,13900

3

Final Answer

13898,13900 13898,13900

Key Points to Remember

Essential concepts to master this topic
  • Rule: Consecutive integers increase by exactly 1 each step
  • Technique: Subtract 1 for predecessor: 13,899 - 1 = 13,898
  • Check: Verify sequence increases by 1: 13,898 → 13,899 → 13,900 ✓

Common Mistakes

Avoid these frequent errors
  • Adding or subtracting 10 or 100 instead of 1
    Don't subtract 100 to get 13,799 or add 100 to get 13,999! This creates gaps in the sequence, not consecutive numbers. Always add or subtract exactly 1 for consecutive integers.

Practice Quiz

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What number comes before 31,000?

FAQ

Everything you need to know about this question

What does consecutive mean in math?

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Consecutive means numbers that follow each other in order with no gaps. Like 5, 6, 7 or 23, 24, 25. Each number is exactly 1 more than the previous one!

Why do I subtract 1 for the number before?

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To find the number immediately before any number, you subtract 1. Think of counting backwards: 15, 14, 13... Each step goes down by 1.

What if the middle number ends in 9?

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No problem! When you add 1 to a number ending in 9, it creates the next number. For example: 13,899 + 1 = 13,900. The 9s become 0s and we carry over to the next place value.

How can I check if my sequence is correct?

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Make sure each number is exactly 1 more than the previous one. Count up: first number → second number → third number. The differences should all be 1!

Do consecutive numbers always increase by 1?

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Yes! Consecutive integers always increase by exactly 1. If numbers increase by 2, 5, or 10, they're not consecutive anymore - they have gaps between them.

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