Can you each work out the number on your card? What do you notice? How could you sort the cards?
Use this grid to shade the numbers in the way described. Which numbers do you have left? Do you know what they are called?
Can you work out what a ziffle is on the planet Zargon?
What is the lowest number which always leaves a remainder of 1 when divided by each of the numbers from 2 to 10?
Work out Tom's number from the answers he gives his friend. He will only answer 'yes' or 'no'.
This big box multiplies anything that goes inside it by the same number. If you know the numbers that come out, what multiplication might be going on in the box?
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?
Can you complete this jigsaw of the multiplication square?
This activity focuses on doubling multiples of five.
Can you see how these factor-multiple chains work? Find the chain which contains the smallest possible numbers. How about the largest possible numbers?
Choose a symbol to put into the number sentence.
The Man is much smaller than us. Can you use the picture of him next to a mug to estimate his height and how much tea he drinks?
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?
Which is quicker, counting up to 30 in ones or counting up to 300 in tens? Why?
If the answer's 2010, what could the question be?
Can you find which shapes you need to put into the grid to make the totals at the end of each row and the bottom of each column?
What happens when you add the digits of a number then multiply the result by 2 and you keep doing this? You could try for different numbers and different rules.
A game for 2 people using a pack of cards Turn over 2 cards and try to make an odd number or a multiple of 3.
Find out what a Deca Tree is and then work out how many leaves there will be after the woodcutter has cut off a trunk, a branch, a twig and a leaf.
Twizzle, a female giraffe, needs transporting to another zoo. Which route will give the fastest journey?
All the girls would like a puzzle each for Christmas and all the boys would like a book each. Solve the riddle to find out how many puzzles and books Santa left.
Using the statements, can you work out how many of each type of rabbit there are in these pens?
This article for teachers describes how modelling number properties involving multiplication using an array of objects not only allows children to represent their thinking with concrete materials,. . . .
Find the product of the numbers on the routes from A to B. Which route has the smallest product? Which the largest?
Number problems at primary level that require careful consideration.
Use 4 four times with simple operations so that you get the answer 12. Can you make 15, 16 and 17 too?
There were 22 legs creeping across the web. How many flies? How many spiders?
Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.
Can you arrange 5 different digits (from 0 - 9) in the cross in the way described?
Imagine a pyramid which is built in square layers of small cubes. If we number the cubes from the top, starting with 1, can you picture which cubes are directly below this first cube?
The clockmaker's wife cut up his birthday cake to look like a clock face. Can you work out who received each piece?
Can you see why 2 by 2 could be 5? Can you predict what 2 by 10 will be?
56 406 is the product of two consecutive numbers. What are these two numbers?
Can you order the digits from 1-3 to make a number which is divisible by 3 so when the last digit is removed it becomes a 2-figure number divisible by 2, and so on?
Using the numbers 1, 2, 3, 4 and 5 once and only once, and the operations x and ÷ once and only once, what is the smallest whole number you can make?
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?
Put operations signs between the numbers 3 4 5 6 to make the highest possible number and lowest possible number.
Suppose we allow ourselves to use three numbers less than 10 and multiply them together. How many different products can you find? How do you know you've got them all?
What is the sum of all the three digit whole numbers?
There are over sixty different ways of making 24 by adding, subtracting, multiplying and dividing all four numbers 4, 6, 6 and 8 (using each number only once). How many can you find?
Use the information about Sally and her brother to find out how many children there are in the Brown family.
Look at what happens when you take a number, square it and subtract your answer. What kind of number do you get? Can you prove it?
Can you replace the letters with numbers? Is there only one solution in each case?
Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?
In the multiplication calculation, some of the digits have been replaced by letters and others by asterisks. Can you reconstruct the original multiplication?
This problem is designed to help children to learn, and to use, the two and three times tables.
If the numbers 5, 7 and 4 go into this function machine, what numbers will come out?
Ben’s class were cutting up number tracks. First they cut them into twos and added up the numbers on each piece. What patterns could they see?
A game for 2 people. Use your skills of addition, subtraction, multiplication and division to blast the asteroids.
Can you work out the arrangement of the digits in the square so that the given products are correct? The numbers 1 - 9 may be used once and once only.