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Decimal places and truncation

The number of decimal places that a number has is equal to the number of digits that appear after the decimal point.

$$1.234567$$ has six decimal places and $$1234.50$$ has two.

Numbers with many decimal places are awkward in calculations, so we can remove some of the decimal places from the right. This is called truncation.

The truncations to two decimal places of the numbers $$$ \Tblue{2.34}56,\quad \Tblue{3.45}678,\quad \Tblue{45.67}8,\quad \Tblue{-129.09}023,\quad \Tblue{12321.1}$$$ are $$$ \Tblue{2.34},\quad \Tblue{3.45},\quad \Tblue{45.67},\quad \Tblue{-129.09},\quad \Tblue{12321.1}.$$$

This display from a set of electric scales can show the mass to two decimal places.
This display from a set of electric scales can show the mass to two decimal places.