No, this statement is not true. 21 is an example of why this is not true.
not necessarily.
Correct. 5 and 2 are factors of 10, and will be factors of any number having 10 as a factor.
Yes.
Yes.
5 is a factor of any whole number ending in 5; it is also a factor of any whole number of 2 or more digits ending in zero.
In order to determine if 2 is a factor of 49 (or any other number), ask yourself if the number is even or odd. If the number is odd, it is not a factor of 2. 49 is odd, so 2 is not a factor of 49. You can also divide 2 into the number. If there is no remainder, 2 is a factor of the number. 49 divided by 2 is 24 with a remainder of 1, so 2 is not a factor of 49.
No. Only 14 and multiples of 14 have both 7 and 2 as factors.
It's easy to see whether 2 is a factor of a number because 2 is a factor of every even number and not a factor of any odd number.
2
Yes, e.g. 28 can be divided by 2 and 4
Yes
No; this statement is not true. The number 6 is an example of why this is not true.