"40 Cross-Number Puzzles: Multiplication & Division" by Bob Olenych offers ...More

"Math Practice Puzzles: Addition and Subtraction" by Bob Olenych is a creat...More

"40 Cross-Number Puzzles: Addition & Subtraction" by Bob Olenych offers a c...More

"40 Cros-Number Puzzles: Fractions, Decimals & Percents" by Bob Olenych off...More