How do we add and increment Javascript numbers?

Here are some examples:

var SLIDEindex = 1; SLIDEindex = SLIDEindex + 1; // increment by one SLIDEindex++; // This is short hand for increment by 1

We can do things like add and subtract numbers together, divide, multiply etc.

var DIGITone = 100; var DIGITtwo = 200; var SUMtotal = DIGITone + DIGITtwo;

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