This is Standard NS1.2 - Add, subtract, multiply, and divide rational numbers (integers, fractions, and terminating decimals) and take positive rational numbers to whole-number powers.

           Now this is Standard NS1.2 in student friendly language - I know how to add, subtract, and divide integers, fractions, and terminating decimals (rational numbers) and make a rational number with a negative exponent into a positive number.

A rational number is a number that can be expressed as a fraction or ratio (rational).  The numerator and the denominator of the fraction are both integers.

          Here is my example problem for Standard NS1.2 : -7 + 5

    Here is an exemplar for my sample problem :

                Step 1.)  Write down the problem

-7 + 5

Step 2.) Add 5 to -7

-2

Step 3.) Check your work

-7 + 5

-2

                    -7   -6     -5    -4     -3    -2   -1    0     1     2     3     4     5     6     7                   

 |------|----|-----|-----|--->|     |      |      |      |      |      |      |     |      |

Now here is an example that  I found on the internet: 

 http://www.emathforall.com/mathss/text/number_sense.html

Go to the bottom of the page for the example