# Sum of the digits

How many are two-digit natural numbers that have the sum of the digits 9?

n =  9

### Step-by-step explanation: Did you find an error or inaccuracy? Feel free to write us. Thank you! ## Related math problems and questions:

• Star equation Write digits instead of stars so that the sum of the written digits is odd and is true equality: 42 · ∗8 = 2 ∗∗∗
• Four-digit numbers Find four-digit numbers where all the digits are different. For numbers, the sum of the third and fourth digits is twice the sum of the first two digits, and the sum of the first and fourth digits is equal to the sum of the second and third digits. The di
• Digit sum How many are three-digit numbers that have a digit sum of 6?
• A five-digit A five-digit odd number has the sum of all digits (digits) five and contains two zeros. If we move each digit in the number one place to the left and move the first digit to the last place, we get a number 20,988 smaller. Find this unknown five-digit numb
• How many How many numbers are less than 222 with a digit sum is 8?
• Six-digit primes Find all six-digit prime numbers that contain each one of digits 1,2,4,5,7, and 8 just once. How many are they? Fill letters instead of digits so the indicated sum (equal letters represent equal digits). What number is hidden under the letter J? A A H A H O A H O J -------------------------- 4 3 2 1
• Three-digit numbers How many are all three-digit numbers that are made up of digits 0,2,5,7 and are divisible by 9 if the digits can be repeated?
• Three digits number From the numbers 1, 2, 3, 4, 5 create three-digit numbers that digits not repeat and number is divisible by 2. How many numbers are there?
• Digits How many five-digit numbers can be written from numbers 0.3,4, 5, 7 that is divided by 10, and if digits can be repeated?
• Dozen What is the product of 26 and 5? Write the answer in an Arabic numeral. Add up the digits. How many of this is in a dozen? Divide #114 by this
• Divisible by nine How many three-digit natural numbers in total are divisible without a remainder by the number 9?
• Classmates Roman is ranked 12th highest and eleventh lowest pupil. How many classmates does Roman have?
• Three numbers Create from digits 1-9 three-digit numbers with their sum the smallest. What value is the sum of these numbers? (Use each digit only once)
• Digits How many odd four-digit numbers can we create from digits: 0, 3, 5, 6, 7? (a) the figures may be repeated (b) the digits may not be repeated
• Chocolate How many times do we have to break a chocolate bar composed of 10 × 12 pieces to get the 120 parts?
• Exhibition The teacher paid 280 Kč for 4.A students for admission to the exhibition. How many students were at the exhibition?