1, 5, 25.
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1, 2, 4, 5, 10, 20, 25, 50, 100, 125, 250, 500.
Only the number 1.
The only number that goes into both 5 and 21 is 1.
A common factor of 100 and 25 is 25. 25 goes into both 100 and 25. A good way to check other numbers is divide the larger number by the smaller number. If you have 10 and 25, that won't work, so you will have to find numbers that go into both. An easy way to do this is find different ways to get each number.Example:2x5=105x5=255 goes into each number at least one time, so it is a common factor.
The go into both 84 and 100 evenly: 1, 2, 4.