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00:03:00
Numbers HK
Harry gives an introduction to the difficulty of writing large numbers in Roman Numerals
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00:06:00
Algebra with Chinese subtitles
How simple algebra can be used to investigate cubes and other polyhedra up to icosahedra.
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00:16:00
Fractions 3
Mutiplying and dividing fractions: a systematic approach to this perennial problem.
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00:25:00