Explore our interactive balance environment, or scroll down for some instructions.
You can drag numbers 1-9 from the table onto the balance trays.
You can create larger numbers using the calculator tool - simply enter the number using the keys.
Clicking on 'OK' puts a box around your number, which you can now drag to one side of the balance.
You can also use the calculator tool to create one side of a number sentence (e.g. 17-2).
Clicking on 'OK' again makes a box around it, which you can drag onto the balance.
As you drag a number or number sentence onto a tray, you will know when you can 'drop' it in place as the balance will become a slightly lighter colour.
You can take numbers/number sentences off a tray at any time.