I. The first problem set involving addition and subtraction of multiples of ten from large numbers in the 5th grade TERC/Investigations Student Activity Book, from Unit 3 of the book [click to enlarge]:
II. The first problem set involving addition and subtraction (and multiplication and division) of multiples of ten from large numbers in the 5th grade Singapore Math Primary Mathematics 5A Workbook, from Unit 1 of the book [click to enlarge]:
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