## What was the contribution of John Napier?

John Napier was a Scottish scholar who is best known for his invention of logarithms, but other mathematical contributions include a mnemonic for formulas used in solving spherical triangles and two formulas known as Napier’s analogies.

### How old was John Napier when he died?

67 years (1550–1617)John Napier / Age at death

**What was Napier bones used for?**

Multiplication

DivisionAdditionSubtractionSquare root

Napier’s bones/Calculation supported

Napier’s bones is a manually-operated calculating device created by John Napier of Merchiston, Scotland for the calculation of products and quotients of numbers. The method was based on lattice multiplication, and also called ‘rabdology’, a word invented by Napier.

**Who invented the logarithm and why?**

John Napier, the Scottish mathematician, published his discovery of logarithms in 1614. His purpose was to assist in the multiplication of quantities that were then called sines.

## What education did John Napier have?

St Salvator’s College

University of St Andrews

John Napier/Education

### Who invented Napiers bones?

John NapierNapier’s bones / Inventor

The Scot, John Napier, invented these strips (originally made from bone) about 400 years ago to help calculate multiplication and division.

**What is Napier method?**

Credit: Ken Welsh/Bridgeman. Portrait of Scottish mathematician, John Napier (1550 – 1617) This method uses a grid to multiply numbers. Multiplying a two-digit number with another two-digit number would require a by grid, for example 43 × 26 .

**When was slide rule invented?**

1622

About 1622, William Oughtred (Figure 1, right), an Anglican Minister, today recognized as the inventor of the slide rule in its actual form, by placing two such scales side by side and sliding them to read the distance relationships, thus multiplying and dividing directly.