Trick to square a 3 digit number with 0 in the center.

To quickly square a 3-digit number with a 0 in the center is very easy. For example, number such as 203, 504, etc.), you can follow this short trick.

Steps:

1. Square the first digit (a) and place it in the ten-thousands place.
2. Square the last digit (b) and place it in the units place.
3. Multiply the first and last digits (a and b), double the result, and place it in the hundreds place.

Example 1: 2003^2

1. Square of 2: 2^2 = 4→ 40000.
2. Square of 3: 3^2 = 9→ 9.
3. Multiply 2 and 3, double it: , then 2 x 3 = 6, then 6 x 2 = 12→ 1200.

Now, add them up:

203^2 = 40000 + 1200 + 9 = 41,209