The two sides of the balance have to balance.
We created lots of balanced numbers. Like this:
You'll notice there's more than one weight on some numbers!
We also did the same thing with an online version from nrich:
We made lots of them!
And a whole lot more!
The challenge, though, is to work out where the weights were the next day!
We're writing them as equations:
We had a look at this game, Weigh It Up, which starts out easy and gets harder too: