problem
Count the digits
Age
5 to 11
Challenge level
In this investigation we are going to count the number of 1s, 2s, 3s etc in numbers. Can you predict what will happen?
problem
I like ...
Age
5 to 7
Challenge level
Mr Gilderdale is playing a game with his class. What rule might he have chosen? How would you test your idea?
problem
Secret number
Age
5 to 7
Challenge level
Annie and Ben are playing a game with a calculator. What was Annie's secret number?
problem
What number?
Age
5 to 7
Challenge level
I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.