Addition and subtraction

$Got \It for Two$

game

Got It for Two

Age

7 to 14

Challenge level

2 out of 3

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

3 out of 3

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

More Plant Spaces

Age

7 to 14

Challenge level

3 out of 3

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

1 out of 3

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

1 out of 3

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

Eight Dominoes

Age

7 to 16

Challenge level

3 out of 3

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

1 out of 3

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

Adding All Nine

Age

11 to 14

Challenge level

1 out of 3

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

Cayley

Age

11 to 14

Challenge level

1 out of 3

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

Tis Unique

Age

11 to 14

Challenge level

1 out of 3

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.