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When Charlie asked his grandmother how old she is, he didn't get a straightforward reply! Can you work out how old she is?
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.
Age 7 to 11
Challenge Level
The activity is intended to extend Great Squares for those who need/want something much more challenging.
Choose one or more of the following five sets of pictures and explore them further for number patterns, area implications, trigonometrical facts and predictions.
$1$
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$2$
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$3$
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$4$
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$5$
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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.