PSAT Math : Negative Numbers
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Example Questions
Example Question #3 : How To Multiply Negative Numbers
Given that 
The expression can be positive, negative, or zero.
The expression must be negative.
The expression must be positive.
The expression must be negative or zero.
The expression must be positive or zero.
The expression must be negative or zero.
If 
Also, if 
Now looking the expression 
Since 
Therefore, 
Since 
Therefore, 
Now to find the sign of the expression we look at the product of the two components. The product of a negative number and a positive number is a negative number; the product of a negative number and zero is zero. Therefore, the correct choice is that 
Example Question #11 : Negative Numbers
Find the product.
When multiplying together two negatives, our value for the product become positive.
Example Question #12 : Negative Numbers
Find the product.
Since we have one positive and one negative multiple, the resulting product must be negative.
Example Question #1 : How To Subtract Negative Numbers
If x is a negative integer, what else must be a negative integer?
x – (–x)
x² – x
x – x
x²
x – (–x)
By choosing a random negative number, for example: –4, we can input the number into each choice and see if we come out with another negative number. When we put –4 in for x, we would have –4 – (–(–4)) or –4 – 4, which is –8. Plugging in the other options gives a positive answer. You can try other negative numbers, if needed, to confirm this still works.
Example Question #2 : Negative Numbers
–7 – 7= x
–7 – (–7) = y
what are x and y, respectively
y = 0, x = 14
x = –14, y = 0
x = 0, y = 0
x = 14, y = –14
x = –14, y = 14
x = –14, y = 0
x: –7 – 7= –7 + –7 = –14
y: –7 – (–7) = –7 + 7 = 0
when subtracting a negative number, turn it into an addition problem
Example Question #31 : Integers
13
15
16
5
2
16
Subtracting a negative number is just like adding its absolute value.
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