In subtraction, you take something away. (It is the opposite of addition. In addtion, you add something on.)
Example
Look at this problem. A number is missing.
You need to find its value.
6 | + | ? | = | 17 |
Answer
You can use subtraction. Here's how.
17 - 6 = 11
So the missing number is = 11
Check your answer:
6 + 11 = 17