Mathematical construction, informal number work for busy hands; grades one and two . LESSON IX Two 8-inch squares contrasting colors. Fold the one to be used for strips into 4 equal 2 of these lengthwise into 2 equal oblongs by freecutting or folding. Fold the other 8-inch square into 4equal oblongs. Fold the 2 free edgesback to meet opposite folded edge. Openand fold the other way in same cuts and weave with 2 narrowstrips first, then a wide one, then twomore narrow strips. Kesult: Fig. 1. m —L_j—LJ L-j—I—I LESSON X Two squares, contrasting colors, any size that is
Mathematical construction, informal number work for busy hands; grades one and two . LESSON IX Two 8-inch squares contrasting colors. Fold the one to be used for strips into 4 equal 2 of these lengthwise into 2 equal oblongs by freecutting or folding. Fold the other 8-inch square into 4equal oblongs. Fold the 2 free edgesback to meet opposite folded edge. Openand fold the other way in same cuts and weave with 2 narrowstrips first, then a wide one, then twomore narrow strips. Kesult: Fig. 1. m —L_j—LJ L-j—I—I LESSON X Two squares, contrasting colors, any size that is largeenough. Fold the one to be used for strips into 2 equal one of these into 2 smaller oblongs. Divide one ofthese 2 small ones into two equal smaller oblongs. Cut. Fold the other square into 4 equal oblongs. Fold the 2 free edges back to oppo-site folded edge. Open and fold theother way in same manner. Make cuts,open and weave, using two narrow stripsfirst, then the wide one, then the othertwo narrow ones ; going over one and un-der two. Eesult: Fiff. 58 MATHEMATICAL CONSTEUCTION LESSON XI Two squares, contrasting colors. Cut the square to be used as strips into 4 equal two of tliese lengthwise and then divide 2 of the nar-row oblongs thus obtained into 2 equal smaller ones. Fold the other square into 8 equaloblongs. Open and fold the other wayinto 4 equal oblongs. Fold back the 2free edges to the opposite folded so that the paper is folded intohalves. Make cuts indicated from folded edge(Fig. 1). Open and weave, going overtwo and under one, using one middlesized strip first; then 2 narrow ones, then1 wide one, then 2 narrow ones, then 1middle sized one. Eesult: Fig. 2. r ! i 1 : i LESSON XII Two squares, contrasting colors. Cut the square to be used as strips into 4 equal oblongsDivide each one of these lengthwise into 4 equal oblongsSixteen narrow strips are the result. Fold the other square into 8 equaloblongs. Open and
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