## bodmas for calculators

The formula above has to be written as a single line with brackets to ensure that the top line is calculated before the division, and that the square root function applies to the result.

√(((5.51 – 6)x^{2} + (5.89 – 6)x^{2} + (6.51 – 6)x^{2})/3) =

We spent an hour working over examples with recent Casio calculators and using a projected spreadsheet today.

The fraction bar notation used in textbooks has a logic for algebraic fractions because it emphasises the cancellation of common factors. It will take a time for the calculators to catch up fully with the traditional notation – perhaps there will be a compromise part way?

Does anyone remember executable notation and APL?