Baravelle
What can you see? What do you notice? What questions can you ask?
Multiplication squares
Can you work out the arrangement of the digits in the square so that the given products are correct? The numbers 1 - 9 may be used once and once only.
Consecutive numbers
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
Beads and bags
Andy's marbles
Andy had a big bag of marbles but unfortunately the bottom of it split and all the marbles spilled out. Use the information to find out how many there were in the bag originally.
Fifteen cards
Can you use the information to find out which cards I have used?
Take three numbers
What happens when you add three numbers together? Will your answer be odd or even? How do you know?
Sealed solution
Ten cards are put into five envelopes so that there are two cards in each envelope. The sum of the numbers inside it is written on each envelope. What numbers could be inside the envelopes?