Concept:An integer is a whole number with no fractional or decimal part. It can be positive, negative, or zero.
Explanation:Check each option to see if it is a whole number.
Option A is
−45, which equals
−1.25. This has a fractional part, so it is not an integer.
Option B is
−32, which is a fraction. It is not a whole number, so it is not an integer.
Option C is
0.5. This number has a decimal part, so it is not an integer.
Option D is
1. It is a whole number with no fractional or decimal part. It can be written as
+1, and it is an integer.
Therefore, the only number among the options that is an integer is
1.
Answer:D.
1