Ten-frames can provide a first step into understanding two-digit numbers simply by the introduction of a second frame. What is the minimum number of small cards that is needed? A task which depends on members of the group noticing the needs of others and responding. What can’t you make? To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

Can you work out how? Number Differences Age 7 to 11 Challenge Level: Start by putting one million 1 into the display of your calculator. What numbers are illustrated? What is the smallest number you can find that lights up all the lights?

You have a set of the digits from 0 — 9.

# Place Value KS1 :

I am less than What’s the smartest solvint to do it? Some of the numbers have fallen off Becky’s number line. Writing Digits Age 5 to 7 Challenge Level: Two-digit Targets Age 5 to 7 Challenge Level: The numbers of the songs are displayed by combining special small single-digit cards.

Try out some calculations. How do you know?

## Place Value KS1

Song Book Age 7 to 11 Challenge Level: Place the numbers from 1 to 9 in the squares below so that the difference between joined squares problek odd. This square jigsaw is written in code. For example, look at the three ten-frames below. Are you surprised by the results? Can you build it up?

What do you notice about the numbers that it produces? Becky created a number plumber which multiplies by 5 and subtracts 4. Find the sum of all three-digit numbers each of whose digits is odd. What happens when you add a three digit number to its reverse?

Take a look at some of these and try to explain why they are true. You could start by thinking about how each of them would write our number 7.

Path of Discovery Series 3: Age 5 to 11 Challenge Level: Number problems at primary level that may require resilience. Dicey Addition Age 5 to 11 Challenge Level: Investigate the different ways these aliens count in this challenge.

Are you surprised by the results? To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

## Place Value KS2

Subtraction Surprise Age 7 to 14 Challenge Level: Can you choose sets of numbers to collect so that you spin six numbers belonging to your sets in as few spins as possible? For example, a 5 year-old might be able to correctly read 62 as sixty-two and 26 as twenty-six, and even know which number is larger, without understanding why the numbers are of differing values.

This arrangement strongly illustrates the idea that ‘five and five make ten’. This article, written for teachers, looks at the different kinds of recordings encountered in Solvlng Mathematics lessons and the importance of not jumping to conclusions! Register for our mailing list. Subtraction Surprise Age 7 to 14 Challenge Level: