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How many 3 digit numbers have a digit sum of 27?
Only one . . . 999 .
How many two-digit numbers are twice the sum of their digits?
Only one . . . . . 18
How many one-digit numbers are twice the size the sum of their digits?
None. The sum of one digit can't be twice the size of the digit.
How many eight digit number are there for which the sum of digit is 4?
120
What is the sum of all possible 2 digit number using the digits 3 and 4?
The sum is 154.
How many 5 digits numbers are there whose digits sum to 22?
There are 5460 five digit numbers with a digit sum of 22.
How many 4 digits numbers can be made using the digits 0 1 2 3 4 5 6 7 8 9 using each digit only once to give the sum 6?
18 can.
What is the sum of all possible four digit numbers using the digits 4068?
-- If you accept 4-digit numbers with 'zero' as the first digit, thenthere are 24 possibilities, and their sum is 119,988 .-- If the first digit can't be a 'zero', then there are 18 possibilities,and their sum is 115,992 .Note: I didn't repeat any digits.-- If you allow repeated digits, and accept leading zeros, then there are 256 possibilities,and their sum is 1,279,872.-- If you allow repeated digits but not leading zeros, then there are only 192 possibilities,and their sum is 1,247,904.
How many two-digit numbers has a digit sum equal to 5?
There are five such numbers.
How many distinct 4-digit numbers have a digit sum of 7?
-3
What is the largest three digit number that has a digit sum of 10?
The largest three-digit number with a digit sum of 10 is 910. This can be determined by maximizing the hundreds place first, setting it to 9, and then adjusting the tens and units places to reach a total digit sum of 10. In this case, using 1 for the tens place and 0 for the units place achieves the desired sum.
If you add several numbers how many significant figures can the sum have?
The number whose farthest right significant digit determines it. Whatever place that digit is in is the last significant digit in the sum. For example: 433 + 150 + 3.67 + 8000 = 8586.67, but in sig figs this is only 9000, as the thousands digit is the lowest digit that can be represented.
