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How do you find out if a number is a multiple of 3?
you add up the digits, and if the sum is a multiple of 3, then the number is divisible by 3!
What is the 2 digit multiple of 8 whose digits add up to 10?
64
Which numbers are not divisible by 9?
The divisibility test for the number 9 is: Any number whose digits add up to 9 or a multiple of 9, is divisible by 9. Any other number the sum of whose digits do not add up to 9 or a multiple of 9, are not divisible by 9.For example, the digits of 81 sum up to 9, and therefore, 81 is divisible by 9. The digits of the number 319381482 add up to 39, and therefore, 319381482 is divisible by 9.
What is a 2 digit multiple of 11 whose digits add up to 12?
The answer is 66.
Is 356 a multiple of 6?
To be a multiple of 6 a number must be even and a multiple of 3.356 is not a multiple of three. The short cut to that is if the digits add up to a multiple of three then the original number is a multiple of 3.
What do the digits of each multiple of 9 add up to?
They also add up to a multiple of 9.
Why do no digits of a prime number add up to 9?
Because they're in multiples of three - a quick way to tell if a number is a multiple of three is to add up the digits and see if the digits add up to a multiple of three e.g 576, 5+7+6=18, 1+8=9, 9 is a multiple of three
When can you say that the number is divisible by 3?
When its digits add up to a multiple of 3.
What do you notice about the sum of the digits for each multiple of 9?
That they add up to 9
How do the digits in each product relate to the factor 9?
If they are multiples of 9, the digits add up to a multiple of 9.
Is 990 divisible by 3?
Any number whose digits add up to a multiple of 3 is divisible by 3. Since the digits of 990 add up to 18, this is a multiple of 3.The sum itself: 990 / 3 = 330
How do you find out if a number is a multiple of 3?
you add up the digits, and if the sum is a multiple of 3, then the number is divisible by 3!
What is the 2 digit multiple of 8 whose digits add up to 10?
64
Is 164 divisible by 3 how do you now?
No. The digits don't add up to a multiple of 3.
Is 1673 divisible by 9?
The digits add up to 17, which is not a multiple of 3. So no.
How do you find out what is divisible by 3?
Add up the digits in the number. If the total is a multiple of 3, the entire number will be a multiple of 3.
What is a two digit multiple of 5 whose digits add up to 13?
The number is 85.
