dividing by 0.1 is the same as multiplying by 10 because 0.1 goes into 1 10 times. So there are 10 times as many 0.1's in a number as there are 1's. You can probably phrase that better! It might be easier to start with a smaller number than 643 then you could always draw it graphically and divide each number into tenths.
what is 613.162 in words
3000 Characters is averaged between 2,000 words to 2,980 words.(allwordphone.com/count-words-characters.htm)
If the teacher asks for alternative words for a given word or words then he's asking for some synonyms or other words that mean the same as the ones you have.
40,000 is forty thousand (in words).
It is 10/10.
Philadelphia Penn
68 = 68/1
It is simply: 7/1
It is 0.00031
her Grandad
12% = 3/25
19/40 = 47.5%
Who I Am
The UK doesn't have a written constitution.
2005 = MMV in Roman numerals
If you mean what clef, that would be treble clef.