1, 2, 3, 4, 6, 8, 12, 16, 24, 48
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The GCF is 4.
The common factors are: 1, 2, 4, 5, 10, 20.
The factors of 144 are 1, 2, 3, 5, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, and 144.
The factors of 48 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, and 48.The prime factors of 48 are: 2 and 3.The factors of 112 are: 1, 2, 4, 7, 8, 14, 16, 28, 56, and 112.The prime factors of 112 are: 2 and 7.The factors of 144 are: 1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, and 144.The prime factors of 144 are: 2 and 3.
Area to be covered: 15 x 16 = 240 square units Area of tile = 12 x 12 = 144 square units Number of tiles required = 240/144 = 1.66... . So 2 tiles will be sufficient.