Place value

problem
Our numbers

Age

5 to 7

Challenge level

These spinners will give you the tens and unit digits of a number. Can you choose sets of numbers to collect so that you spin six numbers belonging to your sets in as few spins as possible?
problem
Halfway

Age

11 to 14

Challenge level

Can you find a number that is halfway between two fractions?
problem
Kangaroo subtraction

Age

11 to 14

Challenge level

Can you solve this 'KANGAROO' alphanumeric subtraction?
problem
Nice or nasty

Age

7 to 11

Challenge level

There are nasty versions of this dice game but we'll start with the nice ones...
problem
Coded hundred square

Age

7 to 11

Challenge level

This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?
problem
Two-digit targets

Age

5 to 7

Challenge level

You have a set of the digits from 0 to 9. Can you arrange these in the five boxes to make two-digit numbers as close to the targets as possible?
problem
Four-digit targets

Age

7 to 11

Challenge level

You have two sets of the digits 0-9. Can you arrange these in the five boxes to make four-digit numbers as close to the target numbers as possible?
problem
Balance power

Age

11 to 18

Challenge level

Using balancing scales what is the least number of weights needed to weigh all integer masses from 1 to 1000? Placing some of the weights in the same pan as the object how many are needed?
problem
One of thirty-six

Age

5 to 7

Challenge level

Can you find the chosen number from the grid using the clues?
problem
What do you need?

Age

7 to 11

Challenge level

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?