You just write what you want. You could write 5 over 9, or write a dash and put 5 on top of it and 9 below, or even write, -59 and then move the 5 and 9 around to their final positions. *You can write just as you would on paper and you can edit it freely!*

- If the user wrote 3× =18, the calculator would immediately show the correct missing number,
**6**, in red so that it is easier to see. Now, here’s our new calculator letting the user change the sum, to one where it is all divided by 5. - You can see the user’s wobbly blue handwriting of the division bar and their digit 5. Immediately, the calculator recognises the handwritten 5 and presents it formally as a typeset digit; at the same time it also re-solves the new equation.
- It gives the answer
**30**. Now the user might want to edit this by moving the 3×6 to the bottom of the equation, alongside the 5 they wrote earlier. They can select and drag the 3×6 easily. - ... and the calculator immediately works out the new answer,
**270**.