File:09-240 Classnotes for Tuesday September 15 2009 page 3.jpg

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NOTE: 2+2 in the addition chart should read 4 and 2+3 should read 5; and

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current18:24, 15 September 2009Thumbnail for version as of 18:24, 15 September 2009783 × 1,029 (364 KB)Yangjiay (talk | contribs)
18:24, 15 September 2009Thumbnail for version as of 18:24, 15 September 2009783 × 1,029 (364 KB)Yangjiay (talk | contribs)

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