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A 3-digit instrument measures to 3 significant digits; A 4-digit instrument measures to 4 significant digits. A 3.5 digit instrument is somewhere in between. Since 0.5 is the log base 10 of 3, the display would be accurate within 3 units in the 4th digit. At least that's what I tried to explain to a bright student in my grade 11 class. She told her engineer dad and he said it was nonsense.
100000000*first digit+10000000*second digit+1000000*third digit+100000*fourth digit+10000*fifth digit+1000*sixth digit+100*seventh digit+10*eightth digit+1*nineth digit
I am a four digit number. My tens digit is 2 more than my ones digit. My hundreds and thousands digit are both 1 less than my ones digit. What number can i be?
one
421 and 842