In this game, children will use their addition and subtraction skills to keep track of the number of toys hidden inside a box when toys are added in or taken out.

The sum of five consecutive integers is equal to the sum of the next three consecutive integers. Can you find the largest of these integers?

How old will Julie be when her age is equal to the sum of her daughters’ ages?

These are the results when 3 numbers were added in pairs. What were the numbers?

Three numbers add up to 100. The difference between the larger two is 12 and the difference between the smaller two is 2. What are the numbers?

Amy misread a question and got an incorrect answer. What should the answer have be?

The sums of the squares of three related numbers is also a perfect square – can you explain why?

15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?

How many pairs of numbers can you find that add up to a multiple of 11? Do you notice anything interesting about your results?

Imagine we have four bags containing a large number of 1s, 4s, 7s and 10s. What numbers can we make?

What is the smallest positive number that can be represented as a sum of consecutive positive integers in six different ways?

Can you find n?