. Grade 8, Illustrative icon

Calculating the square root of 2

Illustrative MathematicsVaries

It is important in many situations to understand the level of accuracy of a calculator. Calculators round answers off so that they can display the best approximation possible on the screen. In the case of an irrational number, it is impossible to display its full decimal expansion as this is infinite and non-repeating. The calculator displays the closest seven (or eight or nine) digit decimal number.

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