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Wednesday, January 8, 2014

Jonathan's integer scribe post

We are going to learn how to deal with integers with ''-'' symbol. That symbol means ''remove''.

first problem: 5-(-2)=
First we have to write it in words for this problem
                                                                         5-(-2)=
                                                            have 5 remove owe 2
Then we look at the last integer which is -2. All integer number always start off with positive and negative signs that are the same amount as the integer number. so -2 is actually>++
                                                                                                           - -
After that you take away the sign that the integer has->  -2  ++
                                                                                         (--)>this leaves
Now you are left with ++ which means you basically turned -2 into a +2.
The ''remove'' sign turns into an ''and'' sign after you change the the last integer into the opposite of what it is.
The last thing you do is to combine it all together which gives you +7      

To see if there is a remove sign all you have to do is look if to signs are right next to each other between two of the numbers and have the same sign (also counts with brackets).  ex. 6--2=                         6-(-2) =


Here are ten questions with answers to see that you know how to do removing integers:
1. (-7)-(-5)= -2                                            - - - - - - ->     combine    < +++++      
owe 7 remove owe 5                                                                          (- - - - -)>this leaves
2. 8-(-5)= 13                                                ++++++++>   combine    <+++++
have 8 remove owe 5                                                                       ( - - - - -)>this leaves
3. 5-(-2)=7                                              +++++>          combine     <++
have 5 remove owe 7                                                                         (- -)>this leaves
4. 1-(-2)= 3                                                     +>          combine     <++
have one remove owe 2                                                                      (- -)>this leaves
5. (-5)-(-4)= -1                                       - - - - ->        combine     <++++
owe 5 remove owe 4                                                                       (- - - -)>this leaves

Now lets switch the strategy up and do negative integers another way. All we have to do is change the last number into the opposite sign and make the remove sign into a combine sign. ex. 5-(-2)=5+2=7
Now lets do them on the last 5 questions.
6. (-6)-(-8)= -6+8= -2
owe 6 remove owe 8
7. (-7)-(-2)= -7+2= -5
owe 7 remove owe 2
8. (-4)-(-9)= -4+9= 5
owe 4 remove owe 9
9. (-2)-(-6)= -2+6= 4
owe 2 remove owe 6
10. (-1)-(-2)= -1+2= 1
 owe 1 remove owe 2

Here is a video that will help you understand removing integers better.

3 comments:

  1. Good Job Jonathan! I liked how you explained each and every step and I liked how you used the steps on how to get the answer for the integer question!

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  2. This comment has been removed by the author.

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  3. Wow, Great job Jonathan! i really understood your explanation of telling us rules about subtracting integers. It's also nice how you put more than 1 example so we can see and understand more for different questions! Great Job!

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