SUBTRACTION is ADDING THE OPPOSITE

At least once in an Algebra Class the students should
see the "WHY" 
in SUBTRACTION becoming ADDING THE OPPOSITE
 in 7 - (-3) becoming 7 + (+3)
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Adding Positive and Negatives

Before starting a new topic try
the review question at the LEFT.

The answers are at the end of this blog!

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****ADDING POSITIVE AND NEGATIVES*****

**************ADDITION OF NUMBERS***********
When we ADD two POSITIVES it is just
our basic ADDITION and the ANSWER IS POSITIVE.
When we ADD two NEGATIVES
(Loss plus another Loss is a LOSS)
just ADD the two numbers and the ANSWER IS NEGATIVE.
so the obvious is just plain OBVIOUS:

(-) plus (-) is = (-)
(+) plus (+) is = (+)

A decision about "LARGER in SIZE"
is necessary when ADDING OPPOSITE SIGNS
(we actually subtract the SIZE):

(+) plus (-) is = (+) as long as the (+BIGGER)

(-) plus (+) is = (+) as long as the (+BIGGER)

(-) plus (+) is = (-) as long as the (-BIGGER)

(+) plus (-) is = (-) as long as the (-BIGGER)

***********try the sample problems below******

*************ANSWERS**************

*****ANSWERS TO PMDAS REVIEW*****