This quote has evolved over time into the quote you see above. The orginal Shakespeare Quote is:
"Though this be madness, yet there is method in 't."
--From Hamlet (II, ii, 206)
Friday, September 28, 2007
MCDL 2.3
Questions and Comments:
Subtraction of Real Numbers
11 comments:
Anonymous
said...
Yo i have sum problems with this can u help me? Some problems that are confusing to me are: 5.3-(-2.5)-4.7 Do you go up? or down? im very confused.
What i dont get is when you have a negative and positive, and you are subtracting, do you go into the positives, or do you go down to negatives... EX: -4.5-2.7=
Thats a negative 4.5 subtracting a 2.7.... Which way are you going? How do you figure it out?
Iw to rs They way I find something like that I check for 2 negatives like the - (-2.5) which means add a positive 2.5… 5.3+2.5=7.8 then -4.7 would make it a 3.1
2.3 responce for R.S. for the answer to your example and question, you go up and down. You change -2.5 to 2.5, because you are subtracting a negative from a positive, so the two are the same: 5.3-(-2.5) is the same as 5.3+2.5 So, you have now 7.8, so you subtract 4.7 to get 3.1 So, when you are on a confusing problem like that, you sometimes have to change the operations from addition to subtraction or the other way around.-A.L.
D.M. to R.S. This problem has two parts. First, since you are subtracting a negative, you actually add it,(5.3+2.5=7.7) Then, you are subtracting a positive, so you go down,(7.7-4.7=3) Remember if needed use PEMDAS. You can also remember that subtracting a negative adds and subtracting a positive loses.
C.T. to R.S. Hey peer! This equation is very simple to figure out. For that type of equation you would go both up and down. Your example is 5.3-(-2.5)-4.7=? You first need to know that if you a negative and a negative symbol side by side, the two negative symbols turn into a addtion sign. So, you new equation would be 5.3+2.5-4.7. This is were you go up because you have to add 5.3 to 2.5. The answer you should get is 7.8. Then, you would be going down because you are subtracting. The next step would have been to subtract 4.7 by 7.8. 7.8-4.7= 3.1. There is your answer. I don't know if this helps you or not, but if it does, that's really good.
when you are subtracting two negatives, like -2-(-6), you can make it easier by changing the minus to a plus, but you then have to change they negative number after the minus to a positive number, so the equation can now be -2+6. It should then be easier to solve the equation. -2+6=4
I can see why you are confused. Here is something that you can remember: two negatives are equal to a positive so whenever you see a problem like -2-(-6) you would add the two negatives so the problem would be rewritten as -2+6=?
JJ to VB subtracting two negatives is like subtracting two positives. If the first number is larger (It's a bigger negative #) then the answer is a negative. If the first# is smaller the answer is positive.
11 comments:
Yo i have sum problems with this can u help me? Some problems that are confusing to me are:
5.3-(-2.5)-4.7
Do you go up? or down? im very confused.
Thx
VB:
another thing that i am having trouble on is subtracting two negatives. i get confused with problem like this...
-2-(-6)=
i am not sure how to subtract problems like these...
can anyone help????
JS:
I have the same problem ad R.S....
What i dont get is when you have a negative and positive, and you are subtracting, do you go into the positives, or do you go down to negatives...
EX:
-4.5-2.7=
Thats a negative 4.5 subtracting a 2.7....
Which way are you going?
How do you figure it out?
Iw to rs
They way I find something like that I check for 2 negatives like the - (-2.5) which means add a positive 2.5… 5.3+2.5=7.8 then -4.7 would make it a 3.1
Iw to rs
2.3 responce for R.S.
for the answer to your example and question, you go up and down. You change
-2.5 to 2.5, because you are subtracting a negative from a positive, so the two are the same:
5.3-(-2.5) is the same as 5.3+2.5
So, you have now 7.8, so you subtract 4.7 to get 3.1
So, when you are on a confusing problem like that, you sometimes have to change the operations from addition to subtraction or the other way around.-A.L.
D.M. to R.S.
This problem has two parts. First, since you are subtracting a negative, you actually add it,(5.3+2.5=7.7) Then, you are subtracting a positive, so you go down,(7.7-4.7=3) Remember if needed use PEMDAS. You can also remember that subtracting a negative adds and subtracting a positive loses.
JS to VB:
Ok, When you have two negatives, like the example that you gave, you are going to add the opposites instead of subtracting them.
So, here is the work for the example you gave:
-2-(-6)
You are going to ADD the opposites:
-2-(-6)= -2 + (-6)
=
-8
There is the answer.
C.T. to R.S.
Hey peer! This equation is very simple to figure out. For that type of equation you would go both up and down. Your example is 5.3-(-2.5)-4.7=?
You first need to know that if you a negative and a negative symbol side by side, the two negative symbols turn into a addtion sign. So, you new equation would be 5.3+2.5-4.7. This is were you go up because you have to add 5.3 to 2.5. The answer you should get is 7.8. Then, you would be going down because you are subtracting. The next step would have been to subtract 4.7 by 7.8. 7.8-4.7= 3.1. There is your answer. I don't know if this helps you or not, but if it does, that's really good.
E. Mu. to VB
when you are subtracting two negatives, like -2-(-6), you can make it easier by changing the minus to a plus, but you then have to change they negative number after the minus to a positive number, so the equation can now be -2+6. It should then be easier to solve the equation.
-2+6=4
DG to VB
I can see why you are confused. Here is something that you can remember: two negatives are equal to a positive so whenever you see a problem like -2-(-6) you would add the two negatives so the problem would be rewritten as
-2+6=?
Does this make it easier for you?
JJ to VB
subtracting two negatives is like subtracting two positives. If the first number is larger (It's a bigger negative #) then the answer is a negative. If the first# is smaller the answer is positive.
-2-(-6)=4
-6-(-2)=-4
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