yeah its fine but teachers hate it!
No, not usually but some emails have to have every letter and digit correct.
Because it is relatively easy to divide the number into a group of 1 and 3. Much harder to do that with a 16-digit number!
100000000
10,000.00 Every three spaces to the left of the decimal point, place a comma.
9876-102=9774The largest 4 digit number, without repetition, is 9876.The smallest 3 digit number is 102.Their difference is 9774.
Assuming you meant the largest 3 digit number without repetition:Largest 4 digit without repetition = 9876Largest 3 digit = 987⇒ difference = 9876 - 987 = 8889
8889
9774
10234
98,765
98765432
Presuming you meant to write the number with a comma -- 27,456 -- the digit 7 represents 7,000, and holds the "thousandths place": The digit 2 represents 20,000 The digit 7 represents 7,000 The digit 4 represents 400 The digit 5 represents 50 The digit 6 represents 6