Topic D includes lessons 9-10. "Add decimals using place value strategies, and relate those strategies to a written method. Subtract decimals using place value strategies, and relate those strategies to a written method." EngageNY
8920_Subtracting_decimals_9_57_8_09.html
8921_Subtracting_decimals_10_1_3_93.html
8919_Adding_three_decimals.html
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