Isn't -2.25 +1.75 equal to -1.5?

- anonymous

Isn't -2.25 +1.75 equal to -1.5?

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- Mertsj

No.

- anonymous

Would you care to expound on that?

- Mertsj

Let's say you have a $1.75 and you want to buy something that costs $2.25. What is your deficiency as far as the money is concerned?

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## More answers

- anonymous

the difference, 50 cents

- Mertsj

There you go. -2.25+1.75=-.5

- anonymous

I know that 0.5 is the correct answer but every time I work it out I get -1.5. I still don't get it.

- anonymous

Can you show me your working please?

- Mertsj

|dw:1328046784853:dw|

- anonymous

but -2 +1 is -1

- Mertsj

When you add two numbers with opposite signs, subtract the two numbers while ignoring the signs. Then give the answer the sign of the bigger number.

- Mertsj

|dw:1328046897675:dw|

- anonymous

then why did u add the fives and... what did you do after that??

- Mertsj

I subtracted the fives. 5-5=0

- anonymous

so what's a one doing over the 2 in the next column?

- Mertsj

I borrowed 1 from the 2. That made the 2 above the 7 into a 12

- Mertsj

I think the problem might be that you don't know how to subtract when you have to borrow.

- Mertsj

What is 523-358?

- anonymous

ok i got that, what if i put it this way, i should get the same answer but i don't|dw:1328047132639:dw|

- Mertsj

When you subtract, you put the bigger number on top.

- anonymous

165

- anonymous

isn't the positive number the bigger one?

- Mertsj

The number with the bigger absolute value. The number that is the bigger if you ignore the signs.

- anonymous

ohhh, didn't know that

- Mertsj

Did you notice how I wrote the problem? That's the way you should write it.

- anonymous

okay, thanks a lot

- Mertsj

yw

- anonymous

wait, how come the answer is negative, a negative and positive 1 are supposed to cancel each other...

- anonymous

oh never mind :)

- anonymous

sign of the bigger number right? got it

- Mertsj

You give the answer the same sign as the number with the greatest absolute value.
2.25 is bigger than 1.75 and 2.25 is negative. So the answer will be negative.

- anonymous

thanks

- Mertsj

yw

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