This activity is best done with a whole class or in a large group. Can you match the cards? What happens when you add pairs of the numbers together?
If you have ten counters numbered 1 to 10, how many can you put into pairs that add to 10? Which ones do you have to leave out? Why?
Two children made up a game as they walked along the garden paths. Can you find out their scores? Can you find some paths of your own?
This box does something to the numbers that go into it. If you know the numbers that come out, what might be going on inside the box?
This investigates one particular property of number by looking closely at an example of adding two odd numbers together.
Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
What two-digit numbers can you make with these two dice? What can't you make?
In this calculation, the box represents a missing digit. What could the digit be? What would the solution be in each case?
This challenge is about finding the difference between numbers which have the same tens digit.
