Find the Predecessor and Successor: Complete the Sequence __, 91, __

Number Sequences with Consecutive Integers

Fill in both the successor as well as the predecessor of the number 91:

□,91,□ \Box,91,\Box

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Step-by-step written solution

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1

Understand the problem

Fill in both the successor as well as the predecessor of the number 91:

□,91,□ \Box,91,\Box

2

Step-by-step solution

To solve this problem, we follow these simple steps to identify the predecessor and successor of the number 91:

  • Step 1: Calculate the predecessor of 91. The predecessor of a number is found by subtracting one from it. Therefore, the predecessor of 91 is 91−1=90 91 - 1 = 90 .
  • Step 2: Calculate the successor of 91. The successor is found by adding one to the number. Therefore, the successor of 91 is 91+1=92 91 + 1 = 92 .

Now, we can fill in the given sequence with the predecessor and successor:

The sequence becomes: 90,91,92 90, 91, 92 .

Therefore, the solution to the problem is 90,92 90, 92 .

In the context of the provided multiple-choice options, the correct choice is option 4, which is 90,92 90, 92 .

3

Final Answer

90,92 90,92

Key Points to Remember

Essential concepts to master this topic
  • Definition: Predecessor is one less, successor is one more
  • Method: For 91: predecessor = 91 - 1 = 90, successor = 91 + 1 = 92
  • Check: Verify sequence flows correctly: 90, 91, 92 are consecutive ✓

Common Mistakes

Avoid these frequent errors
  • Confusing the order of predecessor and successor
    Don't write successor first then predecessor = wrong sequence order! This mixes up which number comes before and after. Always remember: predecessor comes BEFORE the given number, successor comes AFTER.

Practice Quiz

Test your knowledge with interactive questions

Fill in both the successor as well as the predecessor of the number 91:

\( \Box,91,\Box \)

FAQ

Everything you need to know about this question

Which comes first, predecessor or successor?

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The predecessor always comes first! Think of it like a line: predecessor → given number → successor. For 91, it's 90 → 91 → 92.

How do I remember what predecessor and successor mean?

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Predecessor has 'pre' which means 'before' - so it comes before! Successor means it 'succeeds' or follows after the number.

Do predecessor and successor always differ by 1?

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Yes! For consecutive integers, the predecessor is always 1 less and the successor is always 1 more than the given number.

What if the number is negative?

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The same rules apply! For example, if the number is -5, the predecessor is -6 and the successor is -4. Just subtract 1 and add 1 as usual.

Can 0 have a predecessor and successor?

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Absolutely! The predecessor of 0 is -1, and the successor of 0 is 1. Zero fits right in the middle of the integer sequence.

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