Working Backwards at KS1
Tables Teaser
How will you work out which numbers have been used to create this multiplication square?
What Was in the Box?
This big box adds something to any number that goes into it. If you know the numbers that come out, what addition might be going on in the box?
Number Lines
A resource to try once children are familiar with number lines, and they have begun to use them for addition. It could be a good way to talk about subtraction. Leah and Tom each have a number line. Can you work out where their counters will land?
Secret Number
Annie and Ben are playing a game with a calculator. What was Annie's secret number?
Starfish Spotting
How many starfish could there be on the beach, and how many children, if I can see 28 arms?
The Tall Tower
As you come down the ladders of the Tall Tower you collect useful spells. Which way should you go to collect the most spells?
Stop the Clock
This is a game for two players. Can you find out how to be the first to get to 12 o'clock?
Growing Garlic
Ben and his mum are planting garlic. Can you find out how many cloves of garlic they might have had?
Nim-7
Can you work out how to win this game of Nim? Does it matter if you go first or second?
Doing and Undoing
An investigation looking at doing and undoing mathematical operations focusing on doubling, halving, adding and subtracting.
Junior Frogs
Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?