Please note that this has not been updated for the Third Edition: Digital SAT Math. It is Work-In-Progress.
Not every, but several questions on the SAT math sections can be solved without calculation or solved using mental math. The links below show how a student who has diligently completed this book should be able to think and achieve this.
Links are organized as Sections and contain several examples from the book, arranged by Categories. You will require the book to follow through the concepts and examples. Use the links below based on the Edition you bought.
If you don't have the book yet, check out to see how the questions on the SAT Practice Test 10 can be solved without calculation or solved using mental math.
Book: Second Edition
Book: First Edition
SAT Practice Tests