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Number Detective

Follow the clues to find the mystery number.

Birthday Cakes

Jack's mum bought some candles to use on his birthday cakes and when his sister was born, she used them on her cakes too. Can you use the information to find out when Kate was born?

Jig Shapes

Can you each work out what shape you have part of on your card? What will the rest of it look like?


Age 5 to 7
Challenge Level

This problem has been designed to work on in a group of about four. For more details about how you might go about doing this, please read the Teachers' Notes.

You will need to print off these eight cards, which have pictures of glasses of orange and blackcurrant juice on them. You need one set of these cards for your group.

Have a good look at the cards with everyone in your group. Talk to each other about what you notice. Can you sort the cards in different ways?

Now you are ready for the challenge. You will need to print off this set of clue cards. There are ten clue cards altogether.

Give the clue cards out to everyone in your group. Take it in turns to read your cards out loud. Listen out for instructions that tell you what to do, which are written on one or more of the cards.

Can you lay out the pictures of the drinks in the way described by the clue cards?

We would love to hear how you got on with this activity.
Perhaps you can send us a photo of your solution?
Can you tell us which clue cards helped you get started?
How did you know whether your solution was correct?

This activity is taken from Maths Buzz, collaborative reasoning challenges devised by NRICH and published by BEAM. Maths Buzz is out of print but can still be found on Amazon.