1, 3, 9, 71, 213, 639.
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1, 639 Then by inspection of the number 639 , we note that each number is a multiple of '3' . So '3' is a factor. Also , slightly more 'tricky'. If we add the digits of 639 ; 6 + 3 + 9 = 18 1 + 8 = 9 . This means that the number has '9' is a factor. NB This only applies to factors/multiples of '9' Finally, divide 639 by 71 and/or 213 . If you have a whole number answer (No decimals), then those numbers are also factors of 639. Hence 639/71 = 9 & 329 / 213 = 3 So allthe given numbers are factors of 639.
Only one whole number goes into one: 1
The only common factor of ALL those numbers is.... 1 !
Each of these numbers goes evenly into 475: 1, 5, 19, 25, 95, 475.
1, 2 4, and 8 goes into both numbers