The 1089 Number Trick (Reverse & Subtract)
This is a famous and always-working math trick called the 1089 trick.
✨ Step-by-Step Trick
1️⃣ Take any 3-digit number
👉 Condition:
First and last digits must be different
Example: 532
2️⃣ Reverse the number
532 → 235
3️⃣ Subtract the smaller from the bigger
532 − 235 = 297
4️⃣ Reverse the result
297 → 792
5️⃣ Add both numbers
297 + 792 = 1089 🎉
👉 Answer is ALWAYS 1089
🤔 Why Does This Always Work? (Simple Explanation)
Let the number be ABC
A = hundreds digit
B = tens digit
C = units digit
Original number = 100A + 10B + C
Reverse number = 100C + 10B + A
Subtraction:
=> (100A + 10B + C ) - (100C + 10B + A)
=> 99 (A - C)
So the result is always a multiple of 99
Examples:
99 × 1 = 099
99 × 2 = 198
99 × 3 = 297
99 × 4 = 396
...
Now when you reverse and add any of these:
396 + 693 = 1089
✅ Always 1089
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