Amazing calculator trick
Example:
Step 1: Let’s enter 12361236 in the calculator
Step 2: 12361236 is divisible by 137
Step 3: Now divide the result by the fourdigit number
90228 / 1236
The result is 73!
The trick:

Entering a fourdigit number twice means multiplying the fourdigit number by 10001.
Example: 1236 x 10001 = 1236 x (10000 + 1)
= 1236 x 10000 + 1236 x 1
= 12360000 + 1236
= 12361236

Since 10001 = 73 x 137, it is always divisible by 137.

If you divide 12361236 by 137, the remainder will be the product of 73 and the fourdigit number.

If you divide the remainder by the fourdigit number, the remainder will always be 73. Simple!
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Just awesome trick. Why I did not find it earlier. It is so useful and helps to complete so quick.
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