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 |
| [latex]\begin{array}[t]{rr}&8\\ + &3\\ \hline &11\end{array}[/latex] | [latex]\begin{array}[t]{rr}11\\ − &3 \\ \hline &8\end{array}[/latex] |
| [latex]\begin{array}[t]{rr}&3 \\+ &8 \\ \hline &11\end{array}[/latex] | [latex]\begin{array}[t]{rr}11 \\− &8 \\ \hline&3\end{array}[/latex] |
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.
- [latex]\begin{array}[t]{rr}&5\\-&2\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&9\\-&1\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&12\\-&4\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&4\\-&2\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&17\\-&9\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&2\\-&1\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&11\\-&9\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&7\\-&7\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&14\\-&6\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&16\\-&9\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&9\\-&3\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&8\\-&1\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&9\\-&0\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&14\\-&8\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&10\\-&5\\ \hline \\ \end{array}[/latex]
- [latex]\begin{array}[t]{rr}&15\\-&8\\ \hline \\ \end{array}[/latex]
Answers to Exercise One
- 3
- 8
- 8
- 2
- 8
- 1
- 2
- 0
- 8
- 7
- 6
- 7
- 9
- 6
- 5
- 7
Note: There is no self-test for this topic.