MS Excel
You can select a single range of cells by

Clicking the upper-left cell in a group of cells and then pressing the Shift key while clicking the lower right cell in a group of cells
Pressing the Shift key and an arrow key
Pressing the Ctrl key while dragging over the desired cells
Dragging over the desired cells

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MS Excel
Rounding errors can occur

When you use addition and subtraction in a formula
Because excel uses hidden decimal places in computation
When you use multiplication, division, or exponentiation in a formula
When you show the results of formulas with different decimal places that the calculated results

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