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Two numbers have a sum of 30 and a difference of 12 find the two numbers?
21 and 9 21 - 9 = 12 21+9 = 30
What is the divisibility rule for 9?
If you add up the digits, and the sum is divisible by 9 or a multiple of 9.* * * * *For really big numbers you may need to find the digital root (sum of digits) of the digital root.The divisibility rule for 9 is that the sum of the digits of a number must add up to 9 or a multiple of 9.For example, is 81 divisible by 9? Lets find out! 8+1=9. Then it is divisible by 9.
How do you find the sum of something?
the sum is the answer to an addition problem e.g.4+5=9 9 is the sum
What is the sum of the digits in each multiple of 3?
The sum of the digits will be divisible by 3 if the number itself is divisible by 3. Examples: 3999 -> 3 + 9 + 9 + 9 = 30 126 -> 1 + 2 + 6 = 9 6012 -> 6 + 1 + 2 = 9
How do you find the avrage of a number?
The average (arithmetic mean) is the sum of the values divided by the number of values.Example : 5, 9, 10Their sum is 5+9+10 = 24 and there are 3 numbersThe average is 24/3 = 8
