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You just divide it by 21 and if there is no remainder then it went in evenly.
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∙ 11y ago
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How do you know if the number is a factor?
If it divides evenly into the original number with no remainder, it's a factor.
How do you know 3 is a factor of 27?
Because 3 divides evenly into 27 with no remainder.
How do you know when a regula polygon can be used my itself to make a tessellation?
A regular polygon will tessellate if its interior angle divides 360 evenly.
How do you know when a number divides evenly by 3?
add up all of the numbers together and if the sum is divisible by 3 then so is the original number.example:333+3=99/3=333/3=11JANE BROWN
If you know a factor of a number an you find another factor explain?
When the first number can divide the second without remainder. The formal definition would be as follows: For integers x and y, x is a factor of y if there exists an integer n such that y = n*x
How do you know whenether a number is a multiple of another number?
Divide the smaller number into the larger number. If it comes out evenly with no remainder, the larger number is a multiple of the smaller number. All even numbers are multiples of two.
How do you know that 19 is a prime number?
you know that nineteen is a prime number because it only divides by one and itself. hopefully that helped
Is 19 a prime number how do you know?
you know that nineteen is a Prime number because it only divides by one and itself. hopefully that helped
How do you now if a number is a multiple of 9?
You know that it is a multiple of 9 if it divides into 9 equally.
What number can go into 76 and 135 evenly?
1,3,5,9,15,27,45 I know this stuff and that's it.
How do we know if an integer is a odd or even?
If its not divisible by 2 evenly then it is an odd number.
How do you know when a number is divisible by 8?
Numbers are divisible by 8 if the number formed by the last three individual digits is evenly divisible by 8. For example, the last three digits of the number 3624 is 624, which is evenly divisible by 8 so 3624 is evenly divisible by 8.
