Key Skills for Math: Addition and Subtraction Site License. Grade Levels: 1

Your students build addition and subtraction skills with ten progressive practice and reinforcement activities. An easy-to-use assessment report monitors their growth as students: strengthen their number sense; master number fact basics with single-digit addition and subtraction; develop place value skills; practice carrying with two- to four-digit operands; use decimals in addition problems; perform simple single- and double-digit subtraction; use place value concepts to operate with larger numbers; solve two-, three-, and four-digit problems with regrouping; use decimals in multi-digit problems; build their sense of number relationships.