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### Number and algebra

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### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Catrina's Cards

## You may also like

### Month Mania

### Magic Plant

Links to the University of Cambridge website
Links to the NRICH website Home page

Nurturing young mathematicians: teacher webinars

30 April (Primary), 1 May (Secondary)

30 April (Primary), 1 May (Secondary)

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Age 5 to 7

Challenge Level

- Problem
- Getting Started
- Student Solutions
- Teachers' Resources

We had a few solutions come in which showed how Catrina could work out how many football cards she has.

Joshua from Haslingfield Primary School wrote saying:

I used olive stones in five groups of four and counted them.

Georgia from Woodlea Junior School said:

I think the best idea of how to do this would be in your head because it's just 5 x 4.

Shree from The International School Frankfurt in Germany sent in this:-

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Thank you for these ways of calculating, maybe you can see other ways.

Joshua from Haslingfield Primary School wrote saying:

I used olive stones in five groups of four and counted them.

Georgia from Woodlea Junior School said:

I think the best idea of how to do this would be in your head because it's just 5 x 4.

Shree from The International School Frankfurt in Germany sent in this:-

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Thank you for these ways of calculating, maybe you can see other ways.

Can you design a new shape for the twenty-eight squares and arrange the numbers in a logical way? What patterns do you notice?

On Friday the magic plant was only 2 centimetres tall. Every day it doubled its height. How tall was it on Monday?