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?
In this town, houses are built with one room for each person. There are some families of seven people living in the town. In how many different ways can they build their houses?
In Sam and Jill's garden there are two sorts of ladybirds with 7 spots or 4 spots. What numbers of total spots can you make?
Can you use the information to find out which cards I have used?
Can you replace the letters with numbers? Is there only one solution in each case?
Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.