Mutilplication without a calci

1. Write the numbers you wish to multiply, like so

7 x 9 =


2. Under each number write its distance from 10 in a circle, like so

7 x 9 =
(3) (1)


3. Subtract diagonally. Either 7 - 1 or 9 - 3 will give the same result - 6. This is the first half of the answer.

7 x 9 = 6
(3) (1)


4. Now multiply the circled numbers (3) x (1) = 3. This is the second half of the answer.

7 x 9 = 63
(3) (1)


Works for any number!

Let's try with

97 x 75

Painful, isn't it?

Not at all. Watch:

97 x 75 =
(3) (25)

This time we subtract the numbers from 100, not 10.
75 - 3 = 72
25 x 3 = 75

97 x 75 = 7,275