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anonymous

  • 4 years ago

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

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  1. Mertsj
    • 4 years ago
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    No.

  2. anonymous
    • 4 years ago
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    Would you care to expound on that?

  3. Mertsj
    • 4 years ago
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    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?

  4. anonymous
    • 4 years ago
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    the difference, 50 cents

  5. Mertsj
    • 4 years ago
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    There you go. -2.25+1.75=-.5

  6. anonymous
    • 4 years ago
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    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.

  7. anonymous
    • 4 years ago
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    Can you show me your working please?

  8. Mertsj
    • 4 years ago
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    |dw:1328046784853:dw|

  9. anonymous
    • 4 years ago
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    but -2 +1 is -1

  10. Mertsj
    • 4 years ago
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    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.

  11. Mertsj
    • 4 years ago
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    |dw:1328046897675:dw|

  12. anonymous
    • 4 years ago
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    then why did u add the fives and... what did you do after that??

  13. Mertsj
    • 4 years ago
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    I subtracted the fives. 5-5=0

  14. anonymous
    • 4 years ago
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    so what's a one doing over the 2 in the next column?

  15. Mertsj
    • 4 years ago
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    I borrowed 1 from the 2. That made the 2 above the 7 into a 12

  16. Mertsj
    • 4 years ago
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    I think the problem might be that you don't know how to subtract when you have to borrow.

  17. Mertsj
    • 4 years ago
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    What is 523-358?

  18. anonymous
    • 4 years ago
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    ok i got that, what if i put it this way, i should get the same answer but i don't|dw:1328047132639:dw|

  19. Mertsj
    • 4 years ago
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    When you subtract, you put the bigger number on top.

  20. anonymous
    • 4 years ago
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    165

  21. anonymous
    • 4 years ago
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    isn't the positive number the bigger one?

  22. Mertsj
    • 4 years ago
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    The number with the bigger absolute value. The number that is the bigger if you ignore the signs.

  23. anonymous
    • 4 years ago
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    ohhh, didn't know that

  24. Mertsj
    • 4 years ago
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    Did you notice how I wrote the problem? That's the way you should write it.

  25. anonymous
    • 4 years ago
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    okay, thanks a lot

  26. Mertsj
    • 4 years ago
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    yw

  27. anonymous
    • 4 years ago
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    wait, how come the answer is negative, a negative and positive 1 are supposed to cancel each other...

  28. anonymous
    • 4 years ago
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    oh never mind :)

  29. anonymous
    • 4 years ago
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    sign of the bigger number right? got it

  30. Mertsj
    • 4 years ago
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    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.

  31. anonymous
    • 4 years ago
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    thanks

  32. Mertsj
    • 4 years ago
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    yw

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