Here’s what each step actually adds up to:
Mathematics
1,000 + 40 = 1,040
1,040 + 1,000 = 2,040
2,040 + 30 = 2,070
2,070 + 1,000 = 3,070
3,070 + 20 = 3,090
3,090 + 1,000 = 4,090
4,090 + 10 = 4,100
The correct answer is: 4,100 — not 5,000!
Puzzles & Brainteasers
Why Do So Many People Get It Wrong?
At first glance, most people see the repeated “+1000” steps and their brain automatically rounds up the total.
Our minds like patterns and shortcuts — which usually help us in everyday thinking — but in this case, the psychology of expectations misleads us.
Pens
When you see the sequence:
+40
+1,000
+30
+1,000
+20
+1,000
+10
Your brain tends to focus on the thousands first and assumes the smaller numbers must total up to another thousand, even though they don’t.
That split-second assumption is why 5,000 is such a common — yet incorrect — answer.
Neuroscience
A Valuable Mental Tip
Continued on next page:
This riddle is a great reminder that:
Thinking quickly doesn’t always mean thinking correctly.
Small details matter, especially in math and logic.
Slow, intentional reasoning often gives better results than rushing.
These types of puzzles don’t just make great social challenges… they also train your brain to become more attentive and precise.
Your Turn!
Now that you know the correct answer, try sharing this riddle with friends, family, or coworkers.
Self-Help & Motivational
Ask them:
“What do you think the total is — 5,000 or 4,100?”
You’ll probably find that many people, especially those who answer quickly, jump to the wrong conclusion at first.
It’s a fun exercise in careful thinking!
Puzzles & Brainteasers
Final Thoughts
Math riddles like this one are more than just games — they’re useful tools that help sharpen your logical thinking, patience, and attention to detail.
And remember:
Don’t rush
Pay attention to each step
Math rewards careful reasoning
So… how many people in your circle knew the right answer on their first try?
