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Teaching Place-Value Computation (Addition, Subtraction, Multiplication ...

Place Value: The position of a digit relative to the decimal determines the digit’s value. 42,103. The value 2 is in the thousands place, so its place value is 2000 Standard notation: Writing a number with one digit in each place value. 42,103 Expanded notation: Writing a number and showing the place value to each digit. 40,000 + 2,000 + 100 + 3