Mathematical construction, informal number work for busy hands; grades one and two (1911)
Laffin, Nora Louise, 1878- · Chicago, A. Flanagan Company · leaf 108
i of 231=3 1 is i of 3 111212 3 2 22)T 41=4 1 is J of 422=4 2 are J of 4 4 4 4-3 -2 -1 LESSON XV Father Bears Bed—Bulers :3 6 9 12. Material: 2 sheets stiff paper, 9xl2. Divide paper into 12 small squares, usingrulers 369, as in Lesson XII. Make cuts indicated at a, &.squares 1-2. Compare this… … 102 MATHEMATICAL CONSTEUCTION pare 4, 5, 6 to opposite surface. Eelation 1 to 2. If this ismaterial for a pillow-case, how many can be made from largesurface? (Ans. 2 pillow-cases.) If it takes 3 minutes to hem one pillow-case, how longwill it take to hem 2? (Ans. 23 minutes, or 6 minutes.)Make cut…
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