5=5, 10,15,20,25,30,35,40,45,50,55,60,65,70,75,80,85,90,95,100
4=4,8,12,16,20,24,28,32,36,40,44,48,52,56,62,66,70,74,78,82,86,90,94,98,102
The common factors are 20, 40, 70, 90.
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The above statement is incorrect. The above addresses common multiples, not factors.
To find the common factors, first factor the numbers at issue:
5 = 5 * 1
4 = 2 * 2 * 1.
The only common factor is 1.
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1 is the only common factor for 4 and 5.
5 is a Prime number and does not have any factors apart from 1 and itself.
The factors of 4 are 1, 2, and 4. The factors of 10 are 1, 2, 5, and 10. The common factors of 4 and 10 are 1 and 2. This means 2 is the greatest common factor (GCF), and 2 is the only significant common factor, since all numbers have 1 as a factor.
The common factors of 20 and 60 are: 1, 2, 4, 5, 10, and 20 The common factors of 20 and 60 are: 1, 2, 4, 5, 10, and 20.
The common factors of 20 and 35 are: 1 and 5The factors of 20 are: 1, 2, 4, 5, 10, 20The factors of 35 are: 1, 5, 7, 35The common factors are: 1, 5
The common factors of 40 and 60 are: 1, 2, 4, 5, 10, 20.The factors of 40 are:1, 2, 4, 5, 8, 10, 20, 40The factors of 60 are:1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60The common factors are: 1, 2, 4, 5, 10, 20
The factors of 5 are 1 and 5. The factors of 10 are 1, 2, 5, and 10. The factors of 20 are 1, 2, 4, 5, 10, and 20. The common factors are 1 and 5. Therefore, the least (smallest) common factor is 1.