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How many numbers are there whose digits sum to 4?
6
How many numbers are less than 64 whose digits add to 8 and are even?
72
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 three digit numbers are there such whose digits sum is odd?
450.
How many numbers less than 100 have digits whose sum is 10?
There are nine(9) numbers: 19, 28, 37, 46, 55, 64, 73, 82, 91
How many prime numbers are there whose square has 5 or 6 digits?
solution: we know that there are 25 prime numbers are between 1-100 and 168 prime numbers less than 1000. 100 x 100=10000(5 digits) 999 x 999=998001(6 digits) 1000 x 1000=1000000(7 digits) so our answer should be same as the number of prime numbers between 100 to 999. hence, 168-25=143. 143 prime numbers will be there less than 1000 whose square has 5 or 6 digits.
How many numbers less than a thousand have digits less than ten?
All of them. We normally count in decimal numbers and therefore all digits in decimal numbers must be less than ten.
How many 3 digits whole numbers whose sum is 3?
There are no 3-digit whole numbers whose digits sum to 3. The smallest 3-digit number is 100, and the largest is 999, but in neither case is the sum of the digits equal to 3.
How many two digit numbers have digits whose sum is a perfect square?
69
How many 5-digit numbers have digits whose product is equal to 4?
There are 15 of them.
What numbers have digits whose sum is five?
There are infinitely many. For example, 14,104,1004,10004,100004 etc.
How many 3-digit whole numbers have digits whose product equals 24?
-21
