Find the Number Before 69,000: Predecessor Problem

Q: Why isn't the answer 68,900?

That would be subtracting 100, not 1! The predecessor means the very next number before, which is exactly 1 less. So $ 69,000 - 1 = 68,999 $.

Q: What's the difference between predecessor and counting by hundreds?

Predecessor means the immediate previous number (subtract 1). Counting by hundreds means jumping by 100s. These are completely different concepts!

Q: How do I remember which operation to use?

Think of a number line! To find what comes before a number, you move left by 1. Moving left means subtraction: subtract 1.

Q: What if the problem asked for my successor instead?

Then you'd add 1 instead of subtract! Successor means the number that comes after, so $ 69,000 + 1 = 69,001 $.

Finding Predecessors with Large Numbers

My following number is 69,000

Who am I?

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Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

My following number is 69,000

Who am I?

Step-by-step solution

To solve this problem, we'll follow these steps:

Step 1: Identify the given number, which is $69,000$ .
Step 2: Find the number that comes before it by subtracting 1 from 69,000.

Now, let's work through each step:
Step 1: The given number is $69,000$ .
Step 2: To find the preceding number, we calculate $69,000 - 1$ .

Calculating this, we have:
$69,000 - 1 = 68,999$

Therefore, the number preceding $69,000$ is $68,999$ .

Final Answer

$68,999$

Key Points to Remember

Essential concepts to master this topic

Definition: The predecessor is the number that comes immediately before
Technique: Subtract 1 from the given number: $69,000 - 1 = 68,999$
Check: Verify that $68,999 + 1 = 69,000$ ✓

Common Mistakes

Avoid these frequent errors

Subtracting 100 or 1000 instead of 1
Don't subtract 100 to get 68,900 or 1000 to get 68,000! This confuses place value patterns with predecessor rules. Always subtract exactly 1 to find the number that comes immediately before.

Practice Quiz

Test your knowledge with interactive questions

What number comes before 31,000?

FAQ

Everything you need to know about this question

Why isn't the answer 68,900?

That would be subtracting 100, not 1! The predecessor means the very next number before, which is exactly 1 less. So $69,000 - 1 = 68,999$ .

What's the difference between predecessor and counting by hundreds?

Predecessor means the immediate previous number (subtract 1). Counting by hundreds means jumping by 100s. These are completely different concepts!

How do I remember which operation to use?

Think of a number line! To find what comes before a number, you move left by 1. Moving left means subtraction: subtract 1.

Does this work for any number?

Yes! Every whole number has a predecessor. Just subtract 1 from any number to find what comes immediately before it on the number line.

What if the problem asked for my successor instead?

Then you'd add 1 instead of subtract! Successor means the number that comes after, so $69,000 + 1 = 69,001$ .

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