This section is not completed yet, but in the meantime here are some practice questions.
Remember:
Adding a negative number is the same as subtracting:
\begin{align*}
9 + (-6) &= 9 - 6\\
&= 3
\end{align*}
Subtracting a negative number is the same as adding a positive number: \begin{align*} 5 - (-3) &= 5 + 3\\ &= 8 \end{align*}
When adding a positive number to a negative number, the numbers can be rearranged to make a subtraction:
\begin{align*}
-3 + 8 &= 8 + (-3)\\
&= 8 - 3\\
&= 5
\end{align*}
In other words, if you take $3$ steps to the left, then $8$ steps to the right, you’ll end up $5$ steps to the right of the starting point:
To subtract a larger number from a smaller number, you can subtract the smaller one from the larger, then make it negative:
\begin{align*}
2 - 7 &= -(7-2)\\
&= -5
\end{align*}
In other words, if you take $2$ steps to the right, then $7$ steps to the left, you’ll end up $5$ steps to the left of the starting point:
That also applies when adding a small positive number to a negative number:
\begin{align*}
-7 + 2 &= -(7 - 2)\\
&= -5
\end{align*}
In other words, if you take $7$ steps to the left, then $2$ steps to the right, you’ll end up $5$ steps to the left of the starting point:
To subtract a number from a negative number, you can do an addition, then make it negative:
\begin{align*}
-4 - 5 &= - (4 + 5)\\
&= -9
\end{align*}
In other words, if you take $4$ steps to the left, then $5$ steps to the left, you’ll end up $9$ steps to the left of the starting point: