Odd and even numbers

problem

Sorting Numbers

Age

5 to 7

Challenge level

Can you sort numbers into sets? Can you give each set a name?
problem

What Number?

Age

5 to 7

Challenge level

I am less than 25. My ones digit is twice my tens digit. My digits add up to an even number.
problem

Numbers as Shapes

Age

5 to 7

Challenge level

Use cubes to continue making the numbers from 7 to 20. Are they sticks, rectangles or squares?
problem

One of Thirty-Six

Age

5 to 7

Challenge level

Can you find the chosen number from the grid using the clues?
game

Odds and Threes

Age

7 to 11

Challenge level

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.
game

Down to Nothing

Age

7 to 11

Challenge level

A game for 2 or more people. Starting with 100, subratct a number from 1 to 9 from the total. You score for making an odd number, a number ending in 0 or a multiple of 6.
problem

Number Tracks

Age

7 to 11

Challenge level

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?
problem

Three Spinners

Age

7 to 11

Challenge level

These red, yellow and blue spinners were each spun 45 times in total. Can you work out which numbers are on each spinner?
problem

Diagonal Trace

Age

7 to 11

Challenge level

You can trace over all of the diagonals of a pentagon without lifting your pencil and without going over any more than once. Can the same thing be done with a hexagon or with a heptagon?
problem

Sets of Numbers

Age

7 to 11

Challenge level

How many different sets of numbers with at least four members can you find in the numbers in this box?