1 straight line and 2 blocks = 1+ 1
Two straight lines and four blocks = 1+ 1+2.
Three straight lines and seven blocks = 1+ 1+2+3.
Four straight lines 1 1 block = 1+ 1+2+3+4.
Six straight lines 1+ 1+2+3+4+5+6=22 blocks.
N straight lines can be divided into1+1+2+...+n = (1+n) n/2+1.
Pre-school work plan for pre-school classes 1
According to the actual situation of our class, our class has formulated the following educatio