Carson Dellosa Education 
Subtraction, Grade 2 [PDF ebook] 

The Spectrum(R) Subtraction Workbook for second grade features 96 pages of focused practice designed to completely support and challenge students to master subtraction. This standards-based workbook elevates math readiness and establishes a strong foundation for more complex math concepts. Students use visual models to represent problems, understand unknown number equations, and strengthen place value strategies while practicing subtracting within 100. An answer key is included to help parents and teachers accurately gauge skill mastery. The best-selling Spectrum(R) series is a favorite of parents and teachers because it’s carefully designed to be both effective and engaging-the perfect building blocks for a lifetime of learning.