The highest digit is one less than the base used for counting.
So in binary (base 2), the highest digit is 1
In octal (base 8), the highest digit is 7
In decimal (base 10), the highest digit is 9
In hexadecimal (base 16), the highest "digit" is 15. The symbols A, B, C, D, E and F represent the "digits" 10, 11, 12, 13, 14 and 15.
And so on.
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Highest number is 7
Highest 2-digit number = 99 Highest 1-digit number = 9 Highest possible sum from 2, 2-digit numbers = 198 Highest possible sum from 2, 1-digit numbers = 18
987654321 is the highest nine-digit number with no repeated digits.
The diference between the highest 4 digit number and the lowest 3 digit number is 9999 Highest 4 digit: 9999 Lowest 3 digit: 000
The highest place value in a decimal number is the left most digit, also the first digit.