1, 2, and 4. 1, 2 and 4 only.
2 x4=8
1 x8=8
4 x2=8
2 x10=20
1 x20=20
4 x5=20
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The factors of 24 are 1, 2, 3, 4, 6, 8, 12, and 24.The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40.The common factors are 1, 2, 4, and 8.The greatest common factor is 8.The factors of 24 are: 1, 2, 3, 4, 6, 8, 12, 24The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40The common factors are: 1, 2, 4, 81,2,4,8
The GCF of 8 and 20 is 48 = 2 x 2 x 220 = 2 x 2 x 5There are 2 twos in each so 2 x 2 = 4The GCF is 4.Another explanation:The factors of 8 are 1, 2, 4, and 8.The factors of 20 are 1, 2, 4, 5, 10, and 20.The common factors are 1, 2, and 4. Therefore, the greatest common factor is 4.The GCF is 4.
The factors of 40 are 1, 2, 4, 5, 8, 10, 20, and 40
The common factors of 18 and 20 are 1 and 2.
The factors of 5 are:1, 5The factors of 8 are:1, 2, 4, 8The factors of 20 are:1, 2, 4, 5, 10, 20The Greatest Common Factor (GCF) is:1