To find out which number should be removed from Ray's list of factors for 48, we must determine the actual factors of 48.
The factors of a number are defined as the integers that can divide that number without leaving a remainder.
Calculating the factors of 48:
- 48 ÷ 1 = 48 (so 1 is a factor)
- 48 ÷ 2 = 24 (so 2 is a factor)
- 48 ÷ 3 = 16 (so 3 is a factor)
- 48 ÷ 4 = 12 (so 4 is a factor)
- 48 ÷ 6 = 8 (so 6 is a factor)
- 48 ÷ 7 = 6.857... (not a whole number, so 7 is NOT a factor)
- 48 ÷ 8 = 6 (so 8 is a factor)
- 48 ÷ 12 = 4 (so 12 is a factor)
- 48 ÷ 16 = 3 (so 16 is a factor)
- 48 ÷ 24 = 2 (so 24 is a factor)
- 48 ÷ 48 = 1 (so 48 is a factor)
The actual factors of 48 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, and 48.
From Ray's list: 1, 2, 3, 4, 6, 7, 8, 12, 16, 24, 48
We see that the number 7 should be removed from the list, as it is not a factor of 48.
Thus, the answer is: 7
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