Answer: a) 1, d) 23
Step-by-step explanation:
To find out which of the given options are factors of the whole number 23, we need to divide 23 by each of the given options (1, 2, 3, and 23) and check whether the division results in a whole number.
A. 23 ÷ 1 = 23, there is no remainder.
This means that 1 is a factor of 23. ✓
B. 23 ÷ 2 = 11.5, there is a remainder.
This means that 2 is not a factor of 23. ✗
C. 23 ÷ 3 is approximately 7.667, there is a remainder.
This means that 3 is not a factor of 23. ✗
D. 23 ÷ 23 = 1, there is no remainder.
This means that 23 is a factor of 23. ✓
So, the factors of 23 are a) 1 and d) 23.