0 is the ten's digit of the first odd number.
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How about 89
I think the answer is 612!1 (tens digit) which is odd is half of 2 (hundreds digit) and the sum is (6+1+2=9).
Well, isn't that just a happy little mystery we have here! Let's take a closer look at our clues. If the tens digit is half the hundreds digit and the sum of the digits is 9, we can see that the hundreds digit must be 6, the tens digit is 3, and the units digit is 0. So the missing number X is 630. Happy solving, my friend!
The last digit in the product of the first 20 odd natural numbers can be determined by looking at the pattern of the units digit in the multiplication of consecutive odd numbers. The units digit of the product of consecutive odd numbers alternates between 1 and 5. Since there are 10 odd numbers between 1 and 19, and 20 is also an odd number, the last digit in the product of the first 20 odd natural numbers is 5.
The first 5 digit number is 10,000 and the last is 99,999. Thus there are 90,000 numbers between that range. Half of them are odd & half are even. 45,000 each