Using an Abacus/Multiplication

Multiplication is, by definition, the addition of some number so many amount of times. Therefore, to multiply a number by a desired number requires the same principle.

To multiply:
 * 1) Display the original number.
 * 2) Think of desired multiplier.
 * 3) If multiplier has more than one digit, multiply by digits separately
 * 4) Add the original number however many times desired.
 * 5) Move to the next digit and repeat step 4 if multiplier has more than one digit.

Example: (4×5) 4=4 0000-|-0 -0000|-0 4+4=4×2=8 0000-|-0 0-000|0- 8+4=4×3=12 000-0|-0 00-00|-0 12+4=4×4=16 000-0|-0 000-0|0- 16+4=4×5=20 00-00|-0 0000-|-0

Here is another example with one number having two digits: (5×2.5)

5=5 0000-|-0  (0) 0000-|0-   (5) 0000-|-0• (.0) 5×2=10 000-0|-0 0000-|-0 0000-|-0•

5×0.5=2.5 0000-|-0 00-00|-0 0000-|0-•

10+2.5=12.5=5×2.5 000-0|-0 00-00|-0 0000-|0-•