Tiktok - quick mental math trick for multiplying two-digit numbers

⁣This is a short video that demonstrates a simple and quick mental math trick for multiplying two-digit numbers with identical digits by a single-digit number (e.g., 55 x 3 or 22 x 6).
The method is as follows:
Multiply the repeating digit by the other number in the problem. For example, for 55 x 3, you calculate 5 x 3 = 15.
To find the result, write the number from step 1 twice, like 15 15.
Take the first digit of the first number (1) and place it at the beginning of your answer.
Add the second digit of the first number (5) to the first digit of the second number (1). This gives you the middle digit of your answer (5 + 1 = 6).
Take the second digit of the second number (5) and place it at the end of your answer.
This process quickly gives you the final answer: 165.
The video shows this method with the following examples:
55 x 3 = 165
22 x 6 = 132
77 x 5 = 385
33 x 7 = 231
99 x 4 = 396
44 x 8 = ? (The video does not show the final answer for this problem).