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If you just add zeros to a decimal to make it equivalent why does that not change the number?
The important thing to consider is the decimal point.What happens to the position (place value) of the digits of the original number when you add a zero onto the end (of a whole number)?Consider the number 123; where is the decimal point?It is "hiding" at the end after the 3 (it is 123.), thus:the 1 is three places to the left of it and so is worth 100the 2 is two places to the left of it and so is worth 20the 3 is immediately to the left of it and is worth 3Once a '0' is added, the number becomes 1230; again where is the decimal point?It is now "hiding" at the end after the added 0 (it is now 1230.), thus:the 1 is now four places to the left of it and so is now worth 1000the 2 is now three places to the left of it and so is now worth 200the 3 is now two places to the left of it and so is now worth 30So, you can see that in "adding the zero to the end" each of the digits have been moved one place (value column) to the left and so been made 10 times bigger.Now, consider adding a zero to the end of a number with a decimal point:Consider the number 12.3; in this case:the 1 is two places to the left of the decimal point and so is worth 10the 2 is immediately to the left of the decimal point and so is worth 2the 3 is immediately to the right of the decimal point and so is worth 3 tenthsNow, when a zero is added to the end, the number becomes 12.30; the digits are now:the 1 is still two places to the left of the decimal point and so is still worth 10the 2 is still immediately to the left of the decimal point and so is still worth 2the 3 is still immediately to the right of the decimal point and so is still worth 3 tenthsSo the original digits have not changed place (value columns) and have not changed their value.The added 0 has been added in the hundredths column in this example, but its value is no hundredths and has added nothing to the value. Thus the value of the number has not changed by the addition of a zero after the decimal point.
How does the number of decimal places in the product compare to the number of decimal places in the factors?
When you multiply decimals, you just ignore the decimal until the end, then, to find the amount of decimal places in your answer, you add the amount of decimal places in both your factors
How can you divide 156 evenly?
check how many times goes into if it doesn't go evenly put a decimal at the end of the denominator and then put a zero at the end three places over and that is your answer
How many places are there in pi?
There is no end to the number pi...it goes on indefinately. However, pi to the 2oth place is 3.14159265358979323846.
What is 5.12 rounded to three decimal places?
5.120. Mind you, putting an extra "0" on at the end is quite pointless.
