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If you said 3 + 2 = 5 you are of course correct.
Easy isn't it. This is as hard as it gets as long as you remember to think of math as a short hand for ideas you could say in English.
For instance as in our example
Three dogs and two dogs are the same as five dogs all together.
3 + 2 = 5
Math is also used to express distance and time. For example if it is two o'clock now what time was it 3 hours ago? Obviously eleven o'clock. What happened when you got to one o'clock and had to count backwards, you automatically knew that you had to start at twelve again right?
Well its the same thing with negative numbers. Look at the number line