Addition and subtraction

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

Tim had nine cards each with a different number from 1 to 9 on it. How could he have put them into three piles so that the total in each pile was 15?

Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.

Are these domino games fair? Can you explain why or why not?

Ahmed is making rods using different numbers of cubes. Which rod is twice the length of his first rod?

Annie and Ben are playing a game with a calculator. What was Annie's secret number?

These caterpillars have 16 parts. What different shapes do they make if each part lies in the small squares of a 4 by 4 square?

Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.

Use five steps to count forwards or backwards in 1s or 10s to get to 50. What strategies did you use?

Can you work out how many flowers there will be on the Amazing Splitting Plant after it has been growing for six weeks?