An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
One block is needed to make an up-and-down staircase, with one step up and one step down. How many blocks would be needed to build an up-and-down staircase with 5 steps up and 5 steps down?
In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?
Investigate the different numbers of people and rats there could have been if you know how many legs there are altogether!
A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.