Mathematics and the use of mathematical thinking should be much more than what has been traditional school arithmetic. Much of the mathematical reasoning can be developed and experienced out of school, particularly in the home. This material is a teacher's guide designed to help parents support what is done with their children in class. End-of-the-year assessment material is presented. A total of 35 activities on the following concepts and skills are included: (1) computation; (2) scientific notations; (3) logic; (4) word problem; (5) ratio; (6) inequality; (7) area; (8) graphing; (9) geometry; (10) problem; (11) estimation; (12) using data; and (13) use of LOGO. (YP)