Vintage Flash Cards Subtraction Self Teaching Kenworthy

Price: $9.00
Product ID : 1030
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A very nice set of vintage subtraction flash cards.  Made by Kenworthy Educational Service, copyrighted 1948.  I quickly counted 98 cards, could be plus or minus a couple.  They are in their original box with paperwork.  The box is in good condition, light wear, there is a sticker on the front Hammett's School Supplies.  The top card is darker than the rest, I am sure due to age, and it's position in the box.  The cards are otherwise in very good, unused condition, no markings, no tears.  One side has the equation, the other has the equation plus the answer.

The cards measure approx. 3 by 8 3/4 inches.