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Negative numbers are numbers less than zero. They are usually represented with a minus (-) sign in front.
For example, -3, -5, and -1 are all negative numbers.
A key property of negative numbers is that when you multiply two negative numbers, the result is always positive.
However, when you multiply a negative number with a positive number, the result is negative.
This property is very important to understand when solving multiplication problems involving multiple negative numbers.

Positive numbers are numbers greater than zero. They are usually written without any sign or with a plus (+) sign.
For example, 3, 5, and 10 are all positive numbers. When you multiply two positive numbers, the result is always positive.
This property holds true regardless of the order in which you multiply the numbers.
For instance, 3 multiplied by 4 and 4 multiplied by 3 will both give you a result of 12.
Therefore, understanding positive numbers and their multiplication properties is crucial for solving math problems.

To multiply multiple numbers, it is essential to go step-by-step. This way, you minimize errors and fully understand each part of the process.
Let's go through the exercise: \( -3 \cdot (-5) \cdot (-2) \cdot (-1) \). Step 1: Multiply the first two numbers.
First, multiply -3 by -5. Remember, multiplying two negative numbers results in a positive number. So, \( -3 \cdot (-5) = 15 \).
Step 2: Multiply the result from step 1 by the third number.
Next, multiply 15 by -2. Since we are multiplying a positive number with a negative number, the result will be negative.
So, \( 15 \cdot (-2) = -30 \). Step 3: Multiply the result from step 2 by the fourth number.
Finally, multiply -30 by -1. Multiplying two negative numbers will give a positive result.
Therefore, \( -30 \cdot (-1) = 30 \).
By following each step carefully, we see that the final result is 30.