In our numeracy lessons we have been making 20 using 2 numbers. They are called number bonds. We rolled a dice to make a starting number then we had to find the matching pair to make 20.
We have a great game to practise our number bonds, it is called http://www.mathplayground.com/number_bonds_20.html
The next challenge Mrs Gribben set us was to make 20 using 3 numbers, this was tricky.
Can you solve this problem ? 13 + ? + ? = 20