What is the number the sum of two digit is 8?
Solving: x + y = 15 and x – y = -1, we get: x = 7 and y = 8. Hence the actual positive number is 78.
How many 2 digit numbers can you find in which the sum of the digits is 8?
answer may be 17 , 26 35 , 44, 53 ,62 …….
When the digits of a two digit numbers are reversed The new number is 18?
If you reverse the digits of a two digit number, the sum of those digits will always remain the same. The only two single digit numbers that add up to 18 are 9 and 9.
How much is a 2 digit number?
The total number of two digit numbers is 90. From 1 to 99 there are 99 numbers, out of which there are 9 one-digit numbers, i.e., 1, 2, 3, 4, 5, 6, 7, 8 and 9.
What is the sum of 12?
The sum of two numbers is 12. One number is x. The other number is ______.
| 1st number | 2nd number | sum |
|---|---|---|
| 2 | 10 | 12 |
| 6 | 6 | 12 |
| 4 | 8 | 12 |
| x | 12 – x | 12 |
What does the sum of the digits mean?
From Wikipedia, the free encyclopedia. In mathematics, the digit sum of a natural number in a given number base is the sum of all its digits. For example, the digit sum of the decimal number would be .
What is the reverse of a two digit number?
We know that to reverse a number, we should swap the numbers in TENS and ONES position. Therefore, the general form of its reverse ‘ba’ is (10 \times b) + a. Let us try to find the sum of both these numbers. Therefore, the sum of two-digit numbers and their reverse is always a multiple of 11.
When the digits of two digit numbers are reversed the number increases by 27 the sum of such two digit numbers?
So the number is 10*a + b. The digits are reversed when 27 is added to it. Therefore for all the numbers 14 , 25 , 36 , 47 , 58 and 69 the digits are reversed when 27 is added.
What is the sum of the digits of all 2 digit numbers from 10 to 99?
n is the number of two digit numbers, from 10 to 99, there are 90 two digit numbers. and d is the common difference of 1 between each number. S = 45*109 = 4905.