Multiplying with your fingers

Did you know you can use your fingers to multiply between numbers 6 to 10? To do this, it is necessary to identify the fingers as follows:

For example, to calculate 8x9, the 8th finger on the 9th finger on the other hand, as shown in the picture below.

The result will be a two-digit number, where the tens digit will be equal to the sum of the fingers below (including those in contact), and the units digit will be equal to the multiplication of the fingers above. The following figure illustrates multiplication.