Mathematical construction, informal number work for busy hands; grades one and two (1911)
Laffin, Nora Louise, b. 1878 · Chicago : A. Flanagan Company · leaf 132
handled the rulers 2,4,G,8,10, and one of the papers was 12 long. They have dealtwith this length so often that they know it, even though the12-inch ruler is not in their hands. They saw tliat: 22- 4 62=12 ^/o/- 8 2G=1252=10They also saw the combination, separation and divisionof these number… … 126 MATHEMATICAL CONSTEUCTION Make line a-b, measuring from the left with the 11-inchruler. Make line c-d in same manner, using 1-inch ruler tomake marks c-d and long ruler to draw line. Using 8-inch ruler, measuring from top, make line e-f. Using -i-incli ruler, measuring from top, make line g-h.…
Manual training · Paper work
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