Carson Dellosa Education & Spectrum 
Addition, Grade 1 [PDF ebook] 

The Spectrum(R) Addition Workbook for first grade features 96 pages of focused practice designed to completely support and challenge students to adding numbers through 100. This standards-based workbook builds a strong foundation through activities that include using visual models to represent problems, unknown number equations, place value strategies, and fluency drills. This resource provides focused instruction and a systematic approach to skill development. 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.