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Forgot the Numbers

On my calculator I divided one whole number by another whole number and got the answer 3.125 If the numbers are both under 50, what are they?

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Shapes in a Grid

Can you find which shapes you need to put into the grid to make the totals at the end of each row and the bottom of each column?

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Follow the Numbers

What happens when you add the digits of a number then multiply the result by 2 and you keep doing this? You could try for different numbers and different rules.

Four Go

Stage: 2 Challenge Level: Challenge Level:1

Where on the number line do you want to put a mark? How will you make that answer from the numbers in the grid?
You could use a calculator to check your answers if your opponent doesn't agree!
How will you stop your opponent from getting four in a line before you?
Are there any good places on the number line to start? Are there some places which might not be so good to start? Why?
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
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NRICH is part of the family of activities in the Millennium Mathematics Project.