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Subtraction means taking something away. (Addition means adding something on.)

 

Example

Here we have 19 bugs to start with. Our answer is 13. We need to find the missing number.

19 - ? = 13

 

bugbugbugbugbugbugbugbugbugbugbugbugbugbugbugbugbugbugbug

-

bugbugbugbugbugbug

 

Answer

19 - 13 = 6

So 6 is the missing number.

19 - 6 = 13

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