$${\mathtt{10}}{\mathtt{\,\small\textbf+\,}}{\mathtt{3}} = {\mathtt{13}}$$10 - -3
+118723 10--3
You can think of negative numbers as cold numbers.
So this becomes 10 take away cold
If you take away cold out of a room then the room must get warmer! Therefore - - = +
so
10 - - 3 = 10+3=13
---------------------
Another way to deal with it. If 2 plus or minus signs are so close together that you can put a circle around them without anything else getting in the way then.
If the signs are the same you replace them with a +
If the signs are different you replace them with a -
+118723 10--3
You can think of negative numbers as cold numbers.
So this becomes 10 take away cold
If you take away cold out of a room then the room must get warmer! Therefore - - = +
so
10 - - 3 = 10+3=13
---------------------
Another way to deal with it. If 2 plus or minus signs are so close together that you can put a circle around them without anything else getting in the way then.
If the signs are the same you replace them with a +
If the signs are different you replace them with a -
