Decimal places are used in mathematics for the same reasons that commas are used. Decimal places are used to break up large numbers in order to make them easier to read.
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1.7 (1 decimal place) or 1.66 (2 decimal places)
In math, it is spelled "pi". It is an irrational number. The first few decimal places are 3.1415. a more accurate number is 7/22. * * * * * To 4 decimal places, the number is 3.1416 not as given above. And, the rational approximation is 22/7 not 7/22.
0.6851 to 4 decimal places 0.685 to three decimal places 0.69 to two decimal places 0.7 to one decimal place
"Decimal places".
To find the number of decimal places in a product of decimal numbers, add up the total number of decimal places in each of the factors. For example, if you have 2.5 multiplied by 4.75, there are two decimal places in 2.5 and two decimal places in 4.75, so the product will have a total of four decimal places.