To explain why all two digit whole numbers with 5 as the ones’ digit are composite.
Explanation of Solution
Given Information: The number 5 on ones’ digit side.
Formula used: The property of a composite number is that it has more than two factors.
Calculation:
Every multiple of 5 is a composite number except for the number 5 itself.
For instance,let’s take 25. Now, the number is divisible by 5. Hence, the number is composite.
Let’s take another example 75. Here too the number is divisible by 5 hence, is not a prime number thereby being a composite.
Lastly, since both the numbers have more than two factors, therefore they are composite numbers and by this it can be concluded that all the two-digit numbers with ones’ digit as 5 are composite numbers.
Chapter 4 Solutions
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
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