|Other Retailer||Price Checked Time||Their Price in NZD||Our Price|
|Amazon UK||13 days ago||34.67||$20.56||You save $14.11|
David Glover has worked as a research scientist and as a teacher of mathematics and science. He has written best-selling maths and science books and CD-ROMs for all ages, from primary schoolchildren to Open University students. He loves challenging puzzles and problems!