Hi, Scoutmom35.

As far as I know, there is not a topical index like you are describing. As you know, the chapters are divided into overall concepts, Number Sense, Addition, Subtraction, Multiplication, Division, Money, Time, Fractions. Within those disciplines, you can find similar concepts (for example, you can find a negative number game in the subtraction chapter).

In taking a quick glance through the Games Manual, I do not see any games specifically covering inequalities or estimations. However, you can find rounding in the Number Sense chapter.

I hope that helps! Have a great day!
Rachel