Add Thousandths: Horizontal Addition Worksheet

Students align the decimal points and add extra zeros to the right of the number before adding decimals to ensure that each decimal has the same number of digits. Then, for the sum, students add digits at the corresponding places. This worksheet is about practicing with the horizontal format in which numbers are written side by side. To develop flexibility with numbers and operations, students need to have enough practice in this format and not just rely on the vertical/column method.