EXCELLENT set of Pearson / Prentice Hall "Number & Operations" student textbooks (SEE LIST BELOW).
These books target grades 7-9, but were useful in my schoolwide campaign to improve numeracy (via "reaching" then "teaching" and "reteaching") at our high school.
The series uses lots of real-world verbal (word) problems, as well as skill-reinforcing games!
This Lot Includes ...
Clever Counting (Combinatorics) (ISBN: 013180832X)
Prime Time (Factors & Multiples) (ISBN: 0131808079)
Accentuate the Negative (Integers) (ISBN: 0131808184)
Data Around Us (Number Sense) (ISBN: 0131808230)
Comparing and Scaling (Ratio, Proportion, and Percent) (ISBN: 0131808192)
Bits and Pieces I (Understanding Rational Numbers) (ISBN: 0131808109)
Bits and Pieces II (Using Rational Numbers) (ISBN: 0131808125)