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Become an Escher sleuth. (English)
Math. Teach. Middle Sch. 18, No. 6, 378-385 (2013).
Classification: G90 M80
1
Understanding place value. (English)
Teach. Child. Math. 17, No. 9, 558-567 (2011).
Classification: F32 F33 D42 D43
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