Number problems at primary level that may require resilience.
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?
Number problems at primary level to work on with others.
What do the digits in the number fifteen add up to? How many other numbers have digits with the same total but no zeros?
Find the sum of all three-digit numbers each of whose digits is odd.
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?
In the multiplication calculation, some of the digits have been replaced by letters and others by asterisks. Can you reconstruct the original multiplication?
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?
Can you substitute numbers for the letters in these sums?
Number problems at primary level that require careful consideration.
Can you replace the letters with numbers? Is there only one solution in each case?
This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?
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?
Who said that adding couldn't be fun?
Follow the clues to find the mystery number.
Some Games That May Be Nice or Nasty for an adult and child. Use your knowledge of place value to beat your opponent.
Each child in Class 3 took four numbers out of the bag. Who had made the highest even number?
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 arrange the digits 1,2,3,4,5,6,7,8,9 into three 3-digit numbers such that their total is close to 1500?
Have a go at balancing this equation. Can you find different ways of doing it?
What happens when you round these numbers to the nearest whole number?
What happens when you round these three-digit numbers to the nearest 100?
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?
A school song book contains 700 songs. The numbers of the songs are displayed by combining special small single-digit boards. What is the minimum number of small boards that is needed?
What is the sum of all the digits in all the integers from one to one million?
There are six numbers written in five different scripts. Can you sort out which is which?
Replace each letter with a digit to make this addition correct.
Which is quicker, counting up to 30 in ones or counting up to 300 in tens? Why?
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?
When the number x 1 x x x is multiplied by 417 this gives the answer 9 x x x 0 5 7. Find the missing digits, each of which is represented by an "x" .
How many positive integers less than or equal to 4000 can be written down without using the digits 7, 8 or 9?
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.
How many six digit numbers are there which DO NOT contain a 5?
Try out some calculations. Are you surprised by the results?
Becky created a number plumber which multiplies by 5 and subtracts 4. What do you notice about the numbers that it produces? Can you explain your findings?
This addition sum uses all ten digits 0, 1, 2...9 exactly once. Find the sum and show that the one you give is the only possibility.
Number problems for inquiring primary learners.
Consider all of the five digit numbers which we can form using only the digits 2, 4, 6 and 8. If these numbers are arranged in ascending order, what is the 512th number?
Powers of numbers behave in surprising ways. Take a look at some of these and try to explain why they are true.
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.
How many more miles must the car travel before the numbers on the milometer and the trip meter contain the same digits in the same order?
Amazing as it may seem the three fives remaining in the following `skeleton' are sufficient to reconstruct the entire long division sum.
How many solutions can you find to this sum? Each of the different letters stands for a different number.
This article, written for teachers, looks at the different kinds of recordings encountered in Primary Mathematics lessons and the importance of not jumping to conclusions!
Watch our videos of multiplication methods that you may not have met before. Can you make sense of them?
The number 3723(in base 10) is written as 123 in another base. What is that base?
Take any four digit number. Move the first digit to the end and move the rest along. Now add your two numbers. Did you get a multiple of 11?
Carry out cyclic permutations of nine digit numbers containing the digits from 1 to 9 (until you get back to the first number). Prove that whatever number you choose, they will add to the same total.
This article for the young and old talks about the origins of our number system and the important role zero has to play in it.