A+ Click First Grade Math A+ Click First Grade Math focuses on number sense and spatial reasoning. This e-book includes a collection of 100 challenging math problems for K1. Practice makes perfect! Students aged 6 years will enjoy it. The math problems focus on understanding, number sense and spatial reasoning. The e-book presents the best problems from www.aplusclick.com adapted to the e-book format. The website offers over 2000 problems, starting from the very simple and moving toward the extremely difficult.