Stage: 2 Challenge Level: 
| In a minute the average heart pumps 4
litres of blood and beats 70 times. How many litres does it pump in a year? How many beats are there in a leap year? |
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| How old is someone who has lived half a million hours? |
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These problems are based on puzzles from "Eight Days a Week" published by the ATM (Association of Teachers of Mathematics). To order a copy visit their online catalogue . |
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Calculators. Working systematically. Length/distance. Factors and multiples. Trial and improvement. Clock. Multiplication & division. Time. Speed. Addition & subtraction.
Published March 2003,April 2003.
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email: nrich@damtp.cam.ac.uk
