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To find the greatest common factor (GCF) of 63, 36, and 45, we need to determine the largest number that divides evenly into all three numbers. First, we find the factors of each number: 63 (1, 3, 7, 9, 21, 63), 36 (1, 2, 3, 4, 6, 9, 12, 18, 36), and 45 (1, 3, 5, 9, 15, 45). The GCF is the largest number that appears in all three lists, which is 9. Therefore, the greatest common factor of 63, 36, and 45 is 9.
The GCF of 35, 45 and 54 is just 1. There are no common factors between these 3 numbers aside from 1.
1, 3 and 9
1, 2, 3, 4, 6, 9, 12, 18, 36 1, 3, 5, 9, 15, 45
Since 36 is a factor of 72, all of its factors are included in the factors of 72.