Mathematical construction, informal number work for busy hands; grades one and two . urement). If a man earns $ in so much time (indicating largesurface), how much would he earn in so much time? (Ans.^ of $ or $) If a man earns $ and spends ^ of his money, howmuch does he spend ? Make cuts indicated at d, f, a, g. Fold and paste into boxshape. Next day make another just like it, slipping it over thefirst like the cover of a box. Make a coin slit in the is made. For decoration, see Measuring and Weaving,Lesson I, page 68. MEASUEING 95 LESSOX XEnvelope (lu which to keep
Mathematical construction, informal number work for busy hands; grades one and two . urement). If a man earns $ in so much time (indicating largesurface), how much would he earn in so much time? (Ans.^ of $ or $) If a man earns $ and spends ^ of his money, howmuch does he spend ? Make cuts indicated at d, f, a, g. Fold and paste into boxshape. Next day make another just like it, slipping it over thefirst like the cover of a box. Make a coin slit in the is made. For decoration, see Measuring and Weaving,Lesson I, page 68. MEASUEING 95 LESSOX XEnvelope (lu which to keep little freely cut units for decoration). Bulers: 5V72\ Material: Paper left from previous lesson e^xl^. In estimating length of paper, children will get sum of7 and 5 equals 12 even though the 12 ruler is not intheir hands, for they have handled the 12-inch ruler twicewhile making the bank. In estimating width, they will get sum of 5 and 1equals 6 for same reason. They have used 6-inch ruler inLessons III, Til, and YIII. Other numerical values seen: 5 7 7 5 62=12 2-2-5 5 7 5 2 2. 12 Lay 7-inch ruler on left and rightedges, respectively, from upper edge;make marks and draw line a-h. Use 2-inch ruler in the same line c-d. With 1-inch ruler make marks, e-f-g-h. Fold line e-f. Fold line g-Ji. (The children haveno ruler at their desks long enough todraw this line.) Cut out oblongs 1, 2, 3, 4. 96 MATHEMATICAL CONSTEUCTION Fold back oblongs 6, 7, and 5. Compare 5 to opposite surface. Relation 1 to 5. Playoblong 5 is blotter. How many blotters just as large can be cut from oppositesurface ? If large blotting paper costs a nickel, what does small onecost? (1/5 of a nickel or Ic), etc. Put paste on flaps 6 and 7. Paste 8 on them. Cutting from c to e and from d to g makes the fold overflap look better. LESSON XI Taboeet Eulers: 8531. Material: An 8-inch square of rather heavy paper. New numerical relations seen: 5 8 8 3 -3 -5 8 5 3 Lay 5-inch ruler on upper and lower edges, resp
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