Yes. If the integers making up the number add to a number divisible by 3, then it is divisible by 3.
The integers 34215 add up to 15, so it is divisible by 3.
34215/3 = 11405
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Any number whose sum of its digits are equal to a multiple of 3, is divisible by 3. In this instance, the sum of the digits of the number 34215 is equal to 15, which is divisible by 3, and therefore the number is divisible by 3.
Yes it is true. If you add up the sum of all of the numbers in 34215 like this: 3+4+2+1+5, they equal to 15. 15 is a number that is divisible by 3. This strategy works for all numbers.
Yes, if x is an integer divisible by 3, then x^2 is also divisible by 3. This is because for any integer x, x^2 will also be divisible by 3 if x is divisible by 3. This can be proven using the property that the square of any integer divisible by 3 will also be divisible by 3.
All numbers divisible by 3 are NOT divisible by 9. As an example, 6, which is divisible by 3, is not divisible by 9. However, all numbers divisible by 9 are also divisible by 3 because 9 is divisible by 3.
Not evenly. A number is divisible by 3 if the sum of its digits is divisible by 3.