This Logitica Reasoning book is an excellent starting point for learning reasoning at the early stages of the life. Reasoning is the action of thinking in a logical way, which is the key to problem solving by identifying the underlying logic in a problem. To improving reasoning, we will follow the three steps: Determine, Verify and Apply. In this book, we use different arithmetic operations to build the logic for 7+ages kids. This is an excellent first reasoning book for your kid.
This book contains the following chapters:
CH-1    Number Box 
CH-2    Arithmetic Operations
CH-3    Reasoning in a Number Box Problem
CH-4    Addition 
CH-5    Multiplication
CH-6    Subtraction
CH-7    Division
CH-8    Arithmetic on Squares 
CH-9    Arithmetic on Cubes 
CH-10  Mixed Operations   
CH-11  Apply Reasoning