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Which digit what number is the one that determines its precision?
It has no precision, since there is no following number.
Which digit in the following number is the one that determines its precision 78.403?
The one farthest to the right of the decimal point (3).
What does it mean to nearest ten pounds?
To round a number to a particular digit, look at the digit immediately to the right of your target, in this case, the one pound place. If that digit is 4 or lower, zero it and everything to the right of it out. If that digit is 5 or higher, increase the target digit by one and zero everything to the right of it out. If your target digit is a 9, increasing it will turn it to zero and increase the digit to the left of it by one.
How many 3 digit numbers have a digit sum of 27?
Only one . . . 999 .
How many natural numbers between 100 and 1000 have 3 different digits?
The first digit can be any one of 9. (any digit except zero)For each of these . . .The second digit can be any one of 9. (any digit except whatever the first one is)For each of these . . .The third digit can be any one of 8. (any digit except whatever the first 2 are)Total possibilities = 9 x 9 x 8 = 648
