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### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Working Backwards at KS1

### Tables Teaser

### What Was in the Box?

### Number Lines

### Secret Number

### Starfish Spotting

### The Tall Tower

### Stop the Clock

### Growing Garlic

### Nim-7

### Doing and Undoing

### Junior Frogs

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Starting from the end sounds rather strange, but in fact can be a very useful problem-solving skill. These activities lend themselves to being tackled in this way.

This collection is one of our Primary Curriculum collections - tasks that are grouped by topic.

Age 5 to 7

Challenge Level

How will you work out which numbers have been used to create this multiplication square?

Age 5 to 7

Challenge Level

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?

Age 5 to 7

Challenge Level

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?

Age 5 to 7

Challenge Level

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

Age 5 to 7

Challenge Level

How many starfish could there be on the beach, and how many children, if I can see 28 arms?

Age 5 to 7

Challenge Level

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

Age 5 to 7

Challenge Level

This is a game for two players. Can you find out how to be the first to get to 12 o'clock?

Age 5 to 11

Challenge Level

Ben and his mum are planting garlic. Can you find out how many cloves of garlic they might have had?

Age 5 to 11

Challenge Level

Can you work out how to win this game of Nim? Does it matter if you go first or second?

Age 5 to 11

Challenge Level

An investigation looking at doing and undoing mathematical operations focusing on doubling, halving, adding and subtracting.

Age 5 to 11

Challenge Level

Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?