Complete the Number Sequence: Finding Missing Terms Around 9899

Number Sequences with Consecutive Terms

Fill in the missing numbers:

,9899, \Box,9899,\Box

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Fill in the missing numbers:

,9899, \Box,9899,\Box

2

Step-by-step solution

The task is to identify the predecessor and successor of the number 9899 in a sequence of natural numbers.

Step 1: Determine the Predecessor
To find the predecessor of 9899, calculate:

  • 98991=9898 9899 - 1 = 9898

Therefore, the predecessor is 9898.

Step 2: Determine the Successor
To find the successor of 9899, calculate:

  • 9899+1=9900 9899 + 1 = 9900

Therefore, the successor is 9900.

After determining the predecessor and successor, we find:

  • Predecessor: 9898
  • Successor: 9900

The correct choice based on the calculations provided is:

9898,9900 9898,9900

Therefore, the sequence is complete as: 9898, 9899, 9900.

3

Final Answer

9898,9900 9898,9900

Key Points to Remember

Essential concepts to master this topic
  • Rule: Consecutive numbers differ by exactly 1 in natural number sequences
  • Technique: Subtract 1 for predecessor: 98991=9898 9899 - 1 = 9898
  • Check: Verify the sequence flows naturally: 9898, 9899, 9900 ✓

Common Mistakes

Avoid these frequent errors
  • Confusing predecessor and successor positions
    Don't put the successor (9900) before 9899 and predecessor (9898) after = wrong sequence order! This reverses the natural counting direction. Always remember: predecessor comes before, successor comes after in counting order.

Practice Quiz

Test your knowledge with interactive questions

Select the predecessor of the number 2100:

FAQ

Everything you need to know about this question

What's the difference between predecessor and successor?

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The predecessor comes before a number (subtract 1), and the successor comes after a number (add 1). Think of it like counting: 9898 → 9899 → 9900.

Why do we only add or subtract 1?

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In consecutive number sequences, each number is exactly 1 more than the previous number. This follows the natural counting pattern we use every day!

How do I remember which goes where?

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Think of the alphabet: P comes before S, so Predecessor comes before the given number, and Successor comes after it.

What if the number ends in 9?

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No problem! When 9899 becomes 9900, the hundreds place increases and the ones place becomes 0. This is normal in our number system.

Can I use this method for any number?

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Yes! This works for all whole numbers. Just subtract 1 for the predecessor and add 1 for the successor, no matter how big or small the number is.

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