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035 _a(PTEC-PMB)4528114face7d91e
041 0 _aeng
082 4 _a513
100 1 _aEdge Douglas
245 1 0 _aTeaching of fractions from research to practice based on the Singapore math approach
653 _a500 វិទ្យាសាស្ត្រធម្មជាតិ និងគណិតវិទ្យា
942 _cBKEN
_2ddc
999 _c1104
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