How to subtract negative numbers - PSAT Math
Card 0 of 3
If x is a negative integer, what else must be a negative integer?
If x is a negative integer, what else must be a negative integer?
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.
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.
Compare your answer with the correct one above
–7 – 7= x
–7 – (–7) = y
what are x and y, respectively
–7 – 7= x
–7 – (–7) = y
what are x and y, respectively
x: –7 – 7= –7 + –7 = –14
y: –7 – (–7) = –7 + 7 = 0
when subtracting a negative number, turn it into an addition problem
x: –7 – 7= –7 + –7 = –14
y: –7 – (–7) = –7 + 7 = 0
when subtracting a negative number, turn it into an addition problem
Compare your answer with the correct one above
Subtracting a negative number is just like adding its absolute value.
Subtracting a negative number is just like adding its absolute value.
Compare your answer with the correct one above