Subtraction Surprise
Age 7 to 14 Challenge Level:
Try out some calculations. Are you surprised by the results?
Angles Inside
Age 11 to 14 Challenge Level:
Draw some angles inside a rectangle. What do you notice? Can you prove it?
Legs Eleven
Age 11 to 14 Challenge Level:
Take any four digit number. Move the first digit to the end and move the rest along. Now add your two numbers. Did you get a multiple of 11?
Triangle in a Triangle
Age 14 to 16 Challenge Level:
Can you work out the fraction of the original triangle that is covered by the inner triangle?
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.