Yes, because one is common to all integers.
All non-zero integers have at least one common factor, so if your ratio is made up of them, that's why.
Yes.
Yes.
Yes.
Look for common factors. If you find one, divide both numbers by such a common factor.
if one number is odd 2 cannot be a common factor
A ratio always has a common factor, even if it's only 1.
The "common ratio" of a geometric series is any of the numbers, divided by the previous number.If in all cases you get the same ratio (the same result of a division), then you have a common ratio. If the division gives you different numbers, then there is no common ratio.
67 and 53 are both prime numbers, meaning they only have factors of themselves and one. Because of this, they have no common factors greater than one and cannot be reduced.
No, the ratio of two natural numbers can be positive, negative, or zero depending on the numbers being divided.
No; depends on the signs of the rational numbers.
Find a common factor of the number in the ratio. If the common factor is 1, then the ratio cannot be reduced. Otherwise, divide both numbers of the ratio by the common factor. It will have been reduced.