Unit 3: Subtraction

# Topic A: Subtraction

Subtraction takes an amount away from another amount. The result of subtraction is called the difference.

The minus sign − means to subtract.

This says nine minus three equals six or nine take away three is six. The difference between 9 and 3 is 6.

Subtraction is the opposite of addition. Look at the examples:

Addition Subtraction
5 + 4 = 9 9 – 4 = 5
4 + 5 = 9 9 – 5 = 4
$\begin{array}[t]{rr}&8\\ + &3\\ \hline &11\end{array}$ $\begin{array}[t]{rr}11\\ − &3 \\ \hline &8\end{array}$
$\begin{array}[t]{rr}&3 \\+ &8 \\ \hline &11\end{array}$ $\begin{array}[t]{rr}11 \\− &8 \\ \hline&3\end{array}$

Subtraction facts are a tool that you use to do subtraction questions.

Exercise One

Check out your subtraction facts by doing this exercise as quickly as you can. Then, make a list of any subtraction facts you do not know or are tricky for you – practice them.

1. $\begin{array}[t]{rr}&5\\-&2\\ \hline \\ \end{array}$
2. $\begin{array}[t]{rr}&9\\-&1\\ \hline \\ \end{array}$
3. $\begin{array}[t]{rr}&12\\-&4\\ \hline \\ \end{array}$
4. $\begin{array}[t]{rr}&4\\-&2\\ \hline \\ \end{array}$
5. $\begin{array}[t]{rr}&17\\-&9\\ \hline \\ \end{array}$
6. $\begin{array}[t]{rr}&2\\-&1\\ \hline \\ \end{array}$
7. $\begin{array}[t]{rr}&11\\-&9\\ \hline \\ \end{array}$
8. $\begin{array}[t]{rr}&7\\-&7\\ \hline \\ \end{array}$
9. $\begin{array}[t]{rr}&14\\-&6\\ \hline \\ \end{array}$
10. $\begin{array}[t]{rr}&16\\-&9\\ \hline \\ \end{array}$
11. $\begin{array}[t]{rr}&9\\-&3\\ \hline \\ \end{array}$
12. $\begin{array}[t]{rr}&8\\-&1\\ \hline \\ \end{array}$
13. $\begin{array}[t]{rr}&9\\-&0\\ \hline \\ \end{array}$
14. $\begin{array}[t]{rr}&14\\-&8\\ \hline \\ \end{array}$
15. $\begin{array}[t]{rr}&10\\-&5\\ \hline \\ \end{array}$
16. $\begin{array}[t]{rr}&15\\-&8\\ \hline \\ \end{array}$

Answers to Exercise One

1. 3
2. 8
3. 8
4. 2
5. 8
6. 1
7. 2
8. 0
9. 8
10. 7
11. 6
12. 7
13. 9
14. 6
15. 5
16. 7

Note: There is no self-test for this topic.

## License

Adult Literacy Fundamental Mathematics: Book 2 – 2nd Edition Copyright © 2022 by Wendy Tagami and Liz Girard is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.