Addition and subtraction

problem
Sort them out (1)

Age

5 to 7

Challenge level

Can you each work out the number on your card? What do you notice? How could you sort the cards?
problem
Fingers and hands

Age

7 to 11

Challenge level

How would you count the number of fingers in these pictures?
problem
It was 2010!

Age

5 to 11

Challenge level

If the answer's 2010, what could the question be?
problem
Which symbol?

Age

7 to 11

Challenge level

Choose a symbol to put into the number sentence.
problem
Three primes

Age

14 to 16

Challenge level

Weekly Problem 6 - 2010
Can you find three primes such that their product is exactly five times their sum? Do you think you have found all possibilities?
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
Strike it out

Age

5 to 11

Challenge level

Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.
problem
Today's date - 01/06/2009

Age

5 to 11

Challenge level

What do you notice about the date 03.06.09? Or 08.01.09? This challenge invites you to investigate some interesting dates yourself.
problem
Magic Vs

Age

7 to 11

Challenge level

Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?
problem
Highs and lows

Age

11 to 14

Challenge level

What were the maximum and minimum temperatures recorded in my max/min thermometer?