Counting on Facts and addition

If rules are too difficult just call them facts.

 

We define counting on by one and give it the special prime symbol.

Counting on Facts

1=0′

2=1′

We define addition by two facts for counting on.

Counting on by zero fact

n+0 = n

Counting on by one more fact

m+n’ = (m+n)’

This fact says that counting on by one more of the right addend equals counting on by one more from the previous sum.

Examples of counting on facts used to define addition

2+0 = 2

Suppose we have already done

2+3 = 5.

Now we want to do 2+4.  Here 4 = 3′ we also know.

2+4 = 2+3′ = (2+3)’ = 5′ = 6

This is how we use that 2+3 = 5 in the substitution step.

If defining addition is too hard, call it finding addition facts.

 

Advertisements

About New Math Done Right

Author of Pre-Algebra New Math Done Right Peano Axioms. A below college level self study book on the Peano Axioms and proofs of the associative and commutative laws of addition. President of Mathematical Finance Company. Provides economic scenario generators to financial institutions.
This entry was posted in Counting on Facts, Counting on Facts of Addition. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s