Addition and subtraction

Arrange the numbers 1 to 6 in each set of circles below. The sum of each side of the triangle should equal the number in its centre.

At the beginning of May, Tom put his tomato plant outside. On the same day he sowed a bean in another pot. When will the two be the same height?

Use the information about Sally and her brother to find out how many children there are in the Brown family.

As you come down the ladders of the Tall Tower you collect useful spells. Which way should you go to collect the most spells?

Are these statements relating to odd and even numbers always true, sometimes true or never true?

Find a great variety of ways of asking questions which make 8.

This is an adding game for two players. Can you be the first to reach the target?

Place the numbers from 1 to 9 in the squares below so that the difference between joined squares is odd. How many different ways can you do this?

Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.

If the answer's 2010, what could the question be?