Simply look at the number!
The lowest common multiple (lowest number which goes in all three) of 3,2 and 7 is 42. We know that 3, 2 and 7 cannot be divided by one another to give an integer, so we must multiply them to get the LCM.
3 is a factor of 21 and it is not a multiple of 7.
Of any integers, start with dividing by 1, 2, 3. You know /1=86. /2 is 43. That's your answer. Any number after this gives you a smaller number than 40
Designate the unknown number by n. If n/6 = 12, n = 12 X 6 = 72. Another answer: You must be an American. In any other country you would know your 12 times tables and know the answer in your head.
Divide the other into a. If the answer is an integer, a is a multiple of the other.
When it is a factor of that particular number.
By comparing multiple sources and by looking at the references.
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.
If the sum of the digits is a multiple of three, the whole number is a multiple of three.
I think you might mean "multiple." If the sum of a number's digits is a multiple of 9, the original number is as well. If you want to know how you know if a number is a factor of 9, memorize the numbers 1, 3 and 9.
You know that it is a multiple of 9 if it divides into 9 equally.
To calculate whether a number is a multiple of 7, double the last digit and subtract it away from the rest of the number. If this following number divides by 7 without a remainder, then the number is divisible by 7. Continue the process if necessary. In this instance, 100 - (1 x 2) = 98/7 = 14. 1 - (4 x 2) = -7/7 = -1 Therefore, 1001 is a multiple of 7.
Do you mean, "How can you easily know whether or not a number is prime?"
No. The best way for you to know whether you have a multiple pregnancy is by a clinical examination (ie feeling for multiple babies) or, better still, an ultrasound scan.
You normally multiply a number by another number
If it has a 0 or a 5 at the end of it.