Mathematical construction, informal number work for busy hands; grades one and two (1911)
Laffin, Nora Louise, b. 1878 · Chicago : A. Flanagan Company · leaf 50
f A + C B=sum of D+C. =i of B. =B-C. =sum of D+A. =B-D. =B-A. LESSON VIII Chair Fold 16 squares. Cut off one row. Make cut 1. Foldback ah. Compare this with opposite surface. Play it is ablackboard. Pointing to oppositesurface, this blackboard is how manytimes .as large? (5 times.) If ittakes one… … 44 MATHEMATICAL CONSTBUCTION stead of 5. Make cuts 3 and 4. Fold back e and /. Com-pare c-d to what is left on opposite side. Result: Relation 3.By reversing questions get relations 1/5, 1/4, 1/3, respectively. Paste e under h. Paste / under g. Paste a under g and /. Paste c-d on i-j to strengthen…
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