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Metric system.; Measuring instruments.; Tape measures.; Education (Media)--Mathematics.https://mosai...
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Weights and measures--Study and teaching (Elementary); Scales (Weighing instruments); Education (Med...
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Measurement--Study and teaching.; Mathematics--Study and teaching.; Education (Media)--Mathematics.h...
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Counting.; Manipulatives (Education); Arithmetic--Study and teaching (Primary); Education (Media)--M...
Manipulatives (Education); Mathematics--Study and teaching--Audio-visual aids.https://mosaic.messiah...
Clocks and watches--Study and teaching (Primary); Time measurements--Study and teaching (Primary); T...
Color photograph of mathematics teaching aidhttps://digitalcommons.cedarville.edu/cmc_teaching_aids_...