Addition and subtraction

problem
A square of numbers

Age

7 to 11

Challenge level

Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?
problem
The Brown family

Age

5 to 7

Challenge level

Use the information about Sally and her brother to find out how many children there are in the Brown family.
problem
Eggs in baskets

Age

5 to 7

Challenge level

There are three baskets, a brown one, a red one and a pink one, holding a total of 10 eggs. How many eggs are in each basket?
problem
Planet plex time

Age

5 to 7

Challenge level

On Planet Plex, there are only 6 hours in the day. Can you answer these questions about how Arog the Alien spends his day?
problem
The Pied Piper of Hamelin

Age

7 to 11

Challenge level

This problem is based on the story of the Pied Piper of Hamelin. Investigate the different numbers of people and rats there could have been if you know how many legs there are altogether!
problem
Gift stacks

Age

7 to 11

Challenge level

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

Age

7 to 11

Challenge level

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

Age

7 to 11

Challenge level

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
Magic triangle

Age

7 to 11

Challenge level

Place the digits 1 to 9 into the circles so that each side of the triangle adds to the same total.
problem
Reverse trick

Age

7 to 11

Challenge level

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?