Finding the Next Integer: What Number Follows 39,999?

Q: Why does 39,999 + 1 become 40,000 instead of 39,9910?

When adding 1 to 39,999, we get carrying! The 9 in ones place becomes 10 (carry 1), the 9 in tens becomes 10 (carry 1), and so on. All those carries create the new digit in ten-thousands place: $ 40,000 $.

Q: What does 'follows' mean in math?

'Follows' means the very next number in counting order. If you're counting 39,997, 39,998, 39,999, then 40,000 follows next. It's like asking 'what comes next?'

Q: Why isn't the answer 40,100 or 30,000?

Those answers skip numbers! 40,100 would mean we jumped ahead by 101, and 30,000 goes backwards by 9,999. In counting, we only move forward by 1 each time.

Number Sequences with Place Value Transitions

What number follows 39,999?

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Step-by-step written solution

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Understand the problem

What number follows 39,999?

Step-by-step solution

To solve this problem, we need to determine the number that directly follows 39,999 in the sequence of natural numbers.

Step 1: Start with the number provided in the problem: $39,999$ .
Step 2: To find the number that follows, add 1 to the given number: $39,999 + 1$ .
Step 3: Perform the addition: $39,999 + 1 = 40,000$ .

Through these calculations, we find that the number following 39,999 is $40,000$ .

Final Answer

$40,000$

Key Points to Remember

Essential concepts to master this topic

Rule: The next integer is always the current number plus 1
Technique: Add 1 to 39,999: 39,999 + 1 = 40,000
Check: Count backwards from your answer: 40,000 - 1 = 39,999 ✓

Common Mistakes

Avoid these frequent errors

Adding 10 or 100 instead of 1
Don't add 10 to get 40,009 or 100 to get 40,099! This confuses place value changes with basic counting. The word 'follows' means the very next number in sequence. Always add exactly 1 to find the next integer.

Practice Quiz

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What number comes before 31,000?

FAQ

Everything you need to know about this question

Why does 39,999 + 1 become 40,000 instead of 39,9910?

When adding 1 to 39,999, we get carrying! The 9 in ones place becomes 10 (carry 1), the 9 in tens becomes 10 (carry 1), and so on. All those carries create the new digit in ten-thousands place: $40,000$ .

What does 'follows' mean in math?

'Follows' means the very next number in counting order. If you're counting 39,997, 39,998, 39,999, then 40,000 follows next. It's like asking 'what comes next?'

Is there a pattern when numbers like 999, 9999, 99999 get 1 added?

Yes! When you add 1 to numbers ending in all 9's, you get a place value jump:

99 + 1 = 100
999 + 1 = 1,000
39,999 + 1 = 40,000

How can I double-check this without calculating?

Think about counting! If you were counting from 39,995 upward: 39,996, 39,997, 39,998, 39,999... what's the next number you'd say? That's your answer!

Why isn't the answer 40,100 or 30,000?

Those answers skip numbers! 40,100 would mean we jumped ahead by 101, and 30,000 goes backwards by 9,999. In counting, we only move forward by 1 each time.

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