Can you work out some different ways to balance this equation?
Can you complete this calculation by filling in the missing numbers? In how many different ways can you do it?
Have a go at balancing this equation. Can you find different ways of doing it?
Can you replace the letters with numbers? Is there only one solution in each case?
What do the digits in the number fifteen add up to? How many other numbers have digits with the same total but no zeros?
What happens when you round these three-digit numbers to the nearest 100?
This multiplication uses each of the digits 0 - 9 once and once only. Using the information given, can you replace the stars in the calculation with figures?
In the multiplication calculation, some of the digits have been replaced by letters and others by asterisks. Can you reconstruct the original multiplication?
This article for primary teachers encourages exploration of two fundamental ideas, exchange and 'unitising', which will help children become more fluent when calculating.
Number problems at primary level that require careful consideration.
What happens when you round these numbers to the nearest whole number?
Investigate the different ways these aliens count in this challenge. You could start by thinking about how each of them would write our number 7.
The Scot, John Napier, invented these strips about 400 years ago to help calculate multiplication and division. Can you work out how to use Napier's bones to find the answer to these multiplications?
Use two dice to generate two numbers with one decimal place. What happens when you round these numbers to the nearest whole number?
Can you substitute numbers for the letters in these sums?
Start by putting one million (1 000 000) into the display of your calculator. Can you reduce this to 7 using just the 7 key and add, subtract, multiply, divide and equals as many times as you like?
Follow the clues to find the mystery number.
Replace the letters with numbers to make the addition work out correctly. R E A D + T H I S = P A G E
Use your knowledge of place value to try to win this game. How will you maximise your score?
Replace each letter with a digit to make this addition correct.
Choose any 3 digits and make a 6 digit number by repeating the 3 digits in the same order (e.g. 594594). Explain why whatever digits you choose the number will always be divisible by 7, 11 and 13.
By selecting digits for an addition grid, what targets can you make?
Number problems at primary level to work on with others.
Try out this number trick. What happens with different starting numbers? What do you notice?
The letters in the following addition sum represent the digits 1 ... 9. If A=3 and D=2, what number is represented by "CAYLEY"?
Find the sum of all three-digit numbers each of whose digits is odd.
How many solutions can you find to this sum? Each of the different letters stands for a different number.
Number problems at primary level that may require resilience.
Find the values of the nine letters in the sum: FOOT + BALL = GAME
Who said that adding couldn't be fun?
This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?
Where should you start, if you want to finish back where you started?
Visitors to Earth from the distant planet of Zub-Zorna were amazed when they found out that when the digits in this multiplication were reversed, the answer was the same! Find a way to explain. . . .
A school song book contains 700 songs. The numbers of the songs are displayed by combining special small single-digit cards. What is the minimum number of small cards that is needed?
Think of a two digit number, reverse the digits, and add the numbers together. Something special happens...
These tasks will help learners develop their understanding of place value, particularly giving them opportunities to express numbers as amounts.
The Number Jumbler can always work out your chosen symbol. Can you work out how?
One of the key ideas associated with place value is that the position of a digit affects its value. These activities support children in understanding this idea.
Try out some calculations. Are you surprised by the results?
There are nasty versions of this dice game but we'll start with the nice ones...
What happens when you add a three digit number to its reverse?
Some Games That May Be Nice or Nasty for an adult and child. Use your knowledge of place value to beat your opponent.
More upper primary number sense and place value tasks.
In this 100 square, look at the green square which contains the numbers 2, 3, 12 and 13. What is the sum of the numbers that are diagonally opposite each other? What do you notice?
Alf describes how the Gattegno chart helped a class of 7-9 year olds gain an awareness of place value and of the inverse relationship between multiplication and division.
In this article, Alf outlines six activities using the Gattegno chart, which help to develop understanding of place value, multiplication and division.
This feature aims to support you in developing children's early number sense and understanding of place value.
This article develops the idea of 'ten-ness' as an important element of place value.
This article for primary teachers expands on the key ideas which underpin early number sense and place value, and suggests activities to support learners as they get to grips with these ideas.
Four of these clues are needed to find the chosen number on this grid and four are true but do nothing to help in finding the number. Can you sort out the clues and find the number?