Addition and subtraction

problem

Penta Post

Age

7 to 11

Challenge level

1 out of 3

Here are the prices for 1st and 2nd class mail within the UK. You have an unlimited number of each of these stamps. Which stamps would you need to post a parcel weighing 825g?
problem

The Clockmaker's Birthday Cake

Age

7 to 11

Challenge level

1 out of 3

The clockmaker's wife cut up his birthday cake to look like a clock face. Can you work out who received each piece?
problem

Reverse Trick

Age

7 to 11

Challenge level

1 out of 3

Tell your friends that you have a strange calculator that turns numbers backwards. What secret number do you have to enter to make 141 414 turn around?
problem

Sisters and Brothers

Age

7 to 11

Challenge level

1 out of 3

Cassandra, David and Lachlan are brothers and sisters. They range in age between 1 year and 14 years. Can you figure out their exact ages from the clues?
problem

Clock Face

Age

7 to 11

Challenge level

1 out of 3

Where can you draw a line on a clock face so that the numbers on both sides have the same total?
problem

Gift Stacks

Age

7 to 11

Challenge level

1 out of 3

Use the information to work out how many gifts there are in each pile.
problem

Number Tracks

Age

7 to 11

Challenge level

1 out of 3

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

Polo Square

Age

7 to 11

Challenge level

1 out of 3

Arrange eight of the numbers between 1 and 9 in the Polo Square below so that each side adds to the same total.
problem

The Money Maze

Age

7 to 11

Challenge level

1 out of 3

Go through the maze, collecting and losing your money as you go. Which route gives you the highest return? And the lowest?
problem

Two Number Lines

Age

7 to 11

Challenge level

1 out of 3

Max and Mandy put their number lines together to make a graph. How far had each of them moved along and up from 0 to get the counter to the place marked?