- Place ValuenlhukhlTwo-digit whole numbersPlace Value: AdditionThree-digit whole numbersPlace Value: SubtractionAddition In Bases Between 2 and 10Subtraction Bases 2 through 10Number To WordsNumbers to Words (hundreds)Words to NumbersRounding Whole NumbersPlace Value2-digit Counting Bases 2-103 digit Counting Bases 2-10Counting On The Number Line