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Tags: Subtraction
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1981 Teacher, Math 02
"9/30/1981" Two images of an elementary school math teacher working through a subtraction problem on the chalkboard at the front of the classroom.
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Subtraction
1981 Teacher, Math 01
"9/30/1981" Two images of an elementary school math teacher working through a subtraction problem on the chalkboard at the front of the classroom.
Tags:
Subtraction
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