Addition and subtraction

$Got \It for Two$

game

Got It for Two

Age

7 to 14

Challenge level

Got It game for an adult and child. How can you play so that you know you will always win?
problem

More Children and Plants

Age

7 to 14

Challenge level

This challenge extends the Plants investigation so now four or more children are involved.
problem

More Plant Spaces

Age

7 to 14

Challenge level

This challenging activity involves finding different ways to distribute fifteen items among four sets, when the sets must include three, four, five and six items.
game

Twenty20

Age

7 to 16

Challenge level

Fancy a game of cricket? Here is a mathematical version you can play indoors without breaking any windows.
problem

6 by 6 Mathdokus

Age

7 to 16

Challenge level

Can you use the clues to complete these 6 by 6 Mathematical Sudokus?
problem

Eight Dominoes

Age

7 to 16

Challenge level

Using the 8 dominoes, can you make a square where each of the columns and rows adds up to 8?
problem

Calendar Capers

Age

11 to 14

Challenge level

Choose any three by three square of dates on a calendar page...
problem

Adding All Nine

Age

11 to 14

Challenge level

Make a set of numbers that use all the digits from 1 to 9, once and once only. Add them up. The result is divisible by 9. Add each of the digits in the new number. What is their sum? Now try some other possibilities for yourself!
problem

Have You Got It?

Age

11 to 14

Challenge level

Can you explain the strategy for winning this game with any target?
problem

Cayley

Age

11 to 14

Challenge level

The letters in the following addition sum represent the digits 1 ... 9. If A=3 and D=2, what number is represented by "CAYLEY"?