A tool for finding error fractions of multiplier approximations available here.
To do: A tool for helping with a method I made up that lets you do mental arithmetic visually using a grid of factors. This method might be easier and faster, or it might just make things harder. Either way its pretty fun.
| Query param example | Effect |
|---|---|
simple |
Remove the controls and coverage display |
blind |
Don't display the grid numbers |
grid |
Display the grid lines by default |
axes=11,6,5 |
Provide a default to the axis lengths |
hidden=2,2+-1,3 |
Display "???" over the numbers at the given co-ordinates. This is for practising using the system. |