Kenworthy's Silent Teacher, Subtraction: Learning of 126 Combinations, published by Kenworthy Educational Service in Buffalo, New York. This is a set of self-checking cards meant for children to practice their math skills. There are twelve sheets of cards, an instructional sheet, and four envelopes inside of the folder. The front of the folder has "Subtraction" in light blue writing, and there is an illustration of a child writing while sitting at a desk with a light blue background.
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Monday, April 24, 2023 - 09:15
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