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How can you tell that 189 is divisible by 3 without doing the division?
Wiki User
∙ 13y ago
Add up the digits in a number, and if that sum is a multiple of 3, then the original number is also a multiple of 3. So 1 + 8 + 9 = 18, which if you're still not sure then 1+8=9, which is a multiple of 3. You can repetitively sum the digits until you have a result of a single digit number. If the single digit result is 3,6 or 9, then the original number is a multiple of 3. Also, if the single digit number is 9, then the number is also a multiple of 9. However, if the result is 6, then it is not necessarily a multiple of six.
Wiki User
∙ 13y ago
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How do you tell the divisible of 8?
divisible of 4,2,1
How do you tell if a number is divisible by six?
If it's even and divisible by 3, it's divisible by 6.
How can you tell that 9472 is divisible by 8?
The last three digits are divisible by 8.
How do you tell if a number is divisible by 2?
If it ends with an even number then it is divisible by 2
How can you tell wether a number is even or odd?
To determine if a number is even or odd, you can check if the number is divisible by 2. If the number is divisible by 2 without leaving a remainder, then it is even. If the number is not divisible by 2 or leaves a remainder when divided by 2, then it is odd.
How can you tell without dividing that a number is divisible by 8?
There is not an easy way without some division. The simplest is to check the divisibility of the number formed by the last three digits.
How do you tell the divisible of 8?
divisible of 4,2,1
How can you tell without dividing by 8 that 376 is exactly divisible by 8?
If you can cut it in half three times and get a whole number each time, it's divisible by 8.
Is our laboratory room safe?
Without doing a safety inspection we can not tell you.
How do you tell if a number is divisible by six?
If it's even and divisible by 3, it's divisible by 6.
How can you tell if 170 is divisible by 5?
If it ends in a zero, which it does, it is divisible by 5.
Why would your ex tell you about his new car?
a) to show off b) to tell you he's doing fine without you
How can you tell that 9472 is divisible by 8?
The last three digits are divisible by 8.
How do you tell if a number is divisible by 2?
If it ends with an even number then it is divisible by 2
Is 414 equally divisible by 3?
I think the question is mistyped, and should be "Is 414 evenly divisible by 3?" i.e. does it divide by 3 without leaving a remainder. The answer is yes. A quick way to tell if a number is divisible by 3 is to add the digits and if the total is divisible by 3, then the number in question is also divisible by 3 4 + 1 + 4 = 9 and 9 is divisible by 3 414 ÷ 3 = 138
How can you tell without dividing by 6 that 138 is exactly divisible by 6?
1. Sum of digits (12) is divisible by 3, so number is divisible by 3 2. It's an even number so it's divisible by 2 3. If it's divisible by both 3 and 2 then it's divisible by 3 x 2, ie 6.
How do you explain that even without listing all the factors of a number it is easy to tell that they are composite numbers?
To know if a number is composite without listing its factors, you can use these rules:All numbers that end with 2, 4, 6, 8, and 0 (even numbers) are divisible by 2.If the sum of the digits in a number is divisible by 3, the number is divisible by 3.If the last two digits are divisible by 4, the number is divisible by 4.All numbers that have 5 in the one's place are divisible by 5.If a number is divisible by 2 AND is divisible by 3, it is divisible by 6.If the last 3 digits of a number are divisible by 8, the number is divisible by 8.If the sum of the digits of number is divisible by 9, the number is divisible by 9.If a number ends wuth 0, the number is divisible by 10.
