Two books which might be worth looking through:

Since it's usually not good to buy books (which get lost or in the way), to assist in looking through them in the store, the program below can be used in such as a TI-86 calculator, and runs like this:

Page number? 67

Percent = 32

(It is necessary to edit the total number of pages in the book, in the second line down.)

This allows for breaks, in looking through the book, and gives a road map of the progress through it. In addition, "waypoints" can be observed (from the simplest "rational"

17% = 1/6, 20% = 1/5, 25% = 1/4, 33% = 1/3, 50% = 1/2, 67% = 2/3, 75% = 3/4, 80% = 4/5, 83% = 5/6

A similar thing (learning simple waypoints) can be done in reading temperatures in Celsius (which is SI -- in the Metric System, which is used exclusively by MIT's magazine

Input "Page number?", A

(A/207)*100–>B

round(B,0)–>C

Disp "Percent =",C

-- "rational" numbers are those such as 1 or 1/2 (ratios of whole numbers)

-- "irrational" numbers are those such as 2

-- "transcendental" numbers are those such as "e" (2.7 +), "pi" (3.1 +), or trigonometric functions, which are computed with the use of "infinite series" (which keep adding or subtracting "terms" to the result, until the desired accuracy is reached)