THE WEIRD NUMBER: FRACTIONSNow Available On DVD! $59.00 FRACTIONS AND SOME COOL DISTRACTIONSNow Available On DVD! $54.95 MISSING CHICKCOWS: ADDING POSITIVE & NEGATIVE INTEGERSNow Available On DVD! $59.00 NOAH'S ARK: MULTIPLYING WITH FRACTIONSNow Available On DVD! $59.00 ZERO: SOMETHING FOR NOTHINGNow Available On DVD! $59.00 MATHEMATICS OF THE HONEYCOMB $79.00 UNDERSTANDING & USING WHOLE NUMBERS $69.00