Mathematical construction, informal number work for busy hands; grades one and two . ut line 4, fold back whole lowerrow. Compare surface ef with sur-face gh. Compare surface ef with opposite surface. Eelation 1 to 4. Compare surface gh with oj)posite surface. Eelation 1 to 4. Cut line 5. Compare surface e with opposite 1 to 8. Cut line 6. Fold and paste into square prism shape. Play game mentioned. Concrete problems: In Fig. 1, after a is folded to middlefold ask: If this wall (small oblong) needs two rolls of paper topaper it, how many rolls will this wall (opposite surface)
Mathematical construction, informal number work for busy hands; grades one and two . ut line 4, fold back whole lowerrow. Compare surface ef with sur-face gh. Compare surface ef with opposite surface. Eelation 1 to 4. Compare surface gh with oj)posite surface. Eelation 1 to 4. Cut line 5. Compare surface e with opposite 1 to 8. Cut line 6. Fold and paste into square prism shape. Play game mentioned. Concrete problems: In Fig. 1, after a is folded to middlefold ask: If this wall (small oblong) needs two rolls of paper topaper it, how many rolls will this wall (opposite surface)need? (Ans. 3, 2 rolls.) After B is folded to middle fold ask: If one man paintsthis wall in 4 hrs., how long will it take him to paint thisone (opposite surface) ? (Ans. 2, 4 hrs.) Children should keep square prism in school for futurecomparison with the cube which is to be made next out ofthe same sized paper, as square prism was made. FOLDING 39 Surfaces Seen While Making Square Prism Enlarge and draw them on the blackboard. Base concrete problems on some of these comparisons:. H
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