Yes, except that in writing, commas are used as separators in many countries.
Interestingly enough, it's the UK (and former British colonies) that is the odd one out here. Most counties use a comma where the UK uses a period (full stop), in mathematics.
This has caused more problems for me than you'd expect. Especially when dealing with engineers and mathematicians from other countries who are oblivious to what other standards are, it always made me question what they meant and ask them to write it out in words when they sent me data as "1,234" because I wasn't sure if they meant a decimal separator or a digit group separator.
For the benefit of those who don't know what I'm talking about, the two most common decimal separators in the world are the period (
.) and the comma (
,).
π = 3
,14159...
or
π = 3
.14159...
The three most common digit group separators in the world are the space ( ), the period (
.), and the comma (
,).
One thousand = 1 000
I'm invisible lol,
or
One thousand = 1
.000
or
One thousand = 1
,000
The standard currently used in English speaking countries, most former British colonies, a few Asian counties, and the one you should use when using English is the period as the decimal separator and the comma as the digit group separator
Twelve thousand three hundred forty-five and sixty-seven hundredths = 12
,345
.67