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How many 3 digit numbers do the first 2 digits added equal the third?
Wiki User
∙ 13y ago
45 if you don't count numbers that start with a zero, such as 000 or 011. If you do count them it would be 55.
You have 9 that start with 1 as their first digit since the lowest possible sum is 1 (101) and the highest possible sum which can fit in one digit is 9 (189). You have 8 that start with "2" since the lowest possible sum is 2 (202) and the highest possible sum will always be 9 (279). You have 7 that start with 3 since the lowest possible sum is 3 (303) and the highest possible sum is 9 (369) and so on until you get to numbers that start with 9 of which there is only one, 909.
So, you have 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 45. If you count zero as a possible first digit then you can add ten because there's ten that start with zero.
Wiki User
∙ 13y ago
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1348.
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A two digit number whose two digits added together equal 42 and multiplied together equal 82
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21
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What is a four digit number with ascending digits whose first two numbers have a difference of two the third digit is even and the sum of the first three digits equal the last digit?
1348.
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What two prime numbers equal a 400 digit number?
I'm sure there are more than 2 prime numbers that are 400 digits long.
What is the formula to find number of three digit numbers such that sum of the squares of any two digits is equal to third digit?
N squared would be used to find the square root of a number or numbers. In order to find the number of three digit numbers such that the sum of the square results of any two digits are equal to the third digit the use of the formula (HOE)squared=Hsquared*10000+2HE*100+Esquared is needed.
