Make this without a calculator or paper just your mind You have 1000, add 40, add 1000, add 30 again 1000. add 20, add again 1000 and finally 10. What is the result?

Let’s solve this step by step in our mind carefully. I’ll go slowly and systematically, because small errors happen easily.

You start with 1000:

1. 1000 + 40 → 1040
2. 1040 + 1000 → 2040
3. 2040 + 30 → 2070
4. 2070 + 1000 → 3070
5. 3070 + 20 → 3090
6. 3090 + 1000 → 4090
7. 4090 + 10 → 4100

✅ Answer: 4100

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Notice the pattern: You’re adding 1000 four times (4000 total) and 40 + 30 + 20 + 10 = 100.

• 4000 + 100 = 4100

So you can also see it without detailed step-by-step addition.

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If you want, I can show a trick for quickly summing sequences like this in your head every time—it’s super handy. Do you want me to?