The third book in the Life of Fred Intermediate Series Mineshaft:
 
Milligrams and Pounds
Rounding Numbers
a Trillion Pounds of Rice to Cuba
the Number of Stars in a Typical Galaxy
Three-eights of 19,416; Is a Quart less than (<) a Duck?
What to Do with Eleven Hours of Free Time Each Day
Six Is What Fraction of 24? Post Meridiem
Exponents
Extending the Domain of a Function
What Piece of Leather Made Feudalism Possible
Perpendicular Lines
Diminutives; Silent Letters
Rhombus
Can a Four-sided Figure Have Exactly Three Right Angles? Cardinality of Sets
Sectors
Most Horses Achieve Few Outstanding Things in Life and more