# What is the sum of #1+2+3+4+5+6+7+8+9+1234567890+9876543210+99999999+(0xx9001)-9999999+(-999999999)#?

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I want to know

I want to know

##### 1 Answer

#### Explanation:

This is a test to see if you spot thing and give you practice of splitting your solution up into smaller parts.

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Consider

Take the outermost values and pair them then work your way in.

Then there is 5

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Consider

Write as

So the questions sum from the left to this point is:

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Consider

So now we have

So the questions sum from the left to this point is:

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Consider the last value

Plus and minus together like this make a minus so we have

So the questions sum from the left to this point is:

So the last two numbers can be written as

There are different ways of dealing with this. This is just one way

So the questions sum from the left to this point is:

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Consider the last two from the previous part solution