Junior High



  1. 13+12-10
  2. 25-10
  3. 15



we could write this as:


now it is easier to understand what is going on 13 remains as it is. since positive 12 multiplies with a positive one it remains a positive 12 since positive multiplied with positive will always result in a positive answer. Next we multiply positive 10 with a negative 1. this will result in a negative 10 since a positive number multiplied with a negative number always results in a negative answer then you add and subtract them in the order given to get the final result.

Multiplying positive and negative numbers | Pre-Algebra | Khan Academy

Learn some rules of thumb for multiplying positive and negative numbers. Practice this lesson yourself on KhanAcademy.org right now: ...

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