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Depending upon the particular context, you might write 1019, or you could put in a comma and write 1,019. It will mean the same, either way.
The way I learned to abbreviate it in school is "w/," for example, I might write a text message saying, "I'm going w/ Charlie 2 the concert."
A useful way of writing large or small numbers instead of having to write alot of zeros. Example- 5,000= 5 x 1,000= 10 to the 3rd power :)
another way to write 2542 is word form....
XLIII is the modern standard way of writing 43. XXXXIII is more likely the way you would have seen it in Roman times, but might be graded incorrect by a modern day teacher.