Andrew decorated 20 biscuits to take to a party. He lined them up and put icing on every second biscuit and different decorations on other biscuits. How many biscuits weren't decorated?
Same Length Trains
Age 5 to 7 Challenge Level:
You could try with the next shortest rod first.
Have you counted how many white rods Katie used? How might that help? How will you know that you have found them all?