## What is Duplation and mediation?

This method may be called mediation and duplation, where mediation means halving one number and duplation means doubling the other number. It is still used in some areas.

**What is Duplation?**

Definition of duplation : multiplication by repeated doubling (as done formerly especially in Egypt)

**What are the shortcomings of the Napier bones?**

Disadvantages of Napier’s bone: It became tedious when the multiplication has to be done with big numbers. It was a much elaborate setup. It was made up of 200 rods placed in a special box.

### How many rods are in Napier bones?

Napier’s bones, Les Reglettes Financieres: ten wooden rods numbered ‘0’ to ‘9’, in cardboard box with one fixed wooden index rod, made by Eugene Belin et Fils of Paris, c. 1885. Wooden set of Napier’s bones, made between 1650 and 1750, on display in the Discoveries gallery at the National Museum of Scotland.

**What are the disadvantages of abacus?**

What were the disadvantages of the Abacus?

- You cant learn abacus without a tool.
- You need to learn the abacus tool before using it.
- You cant perform complex calculations.
- Using Abacus one cant keep a track of results if they are performing multiple calculations.

**How does napiers bone work?**

By placing “bones” corresponding to the multiplier on the left side and the bones corresponding to the digits of the multiplicand next to it to the right, and product can be read off simply by adding pairs of numbers (with appropriate carries as needed) in the row determined by the multiplier.

## Do abacus confuse kids?

Will my child get confused between abacus math and school math? No, it does not interfere with the school methods of teaching math. Abacus is considered to be an effective tool for learning mental math techniques to solve simple to complex arithmetic calculations.