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ma 128 1.2

by: Molly Fiore

ma 128 1.2 MA-128-03

Molly Fiore
GPA 1.6

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About this Document

addition and subtraction properties
Numbers & Operations Educators
Dr Ewelina Suchacka McBroom
Class Notes
math for educators
25 ?




Popular in Numbers & Operations Educators

Popular in Math

This 2 page Class Notes was uploaded by Molly Fiore on Sunday January 10, 2016. The Class Notes belongs to MA-128-03 at Southeast Missouri State University taught by Dr Ewelina Suchacka McBroom in Spring 2016. Since its upload, it has received 23 views. For similar materials see Numbers & Operations Educators in Math at Southeast Missouri State University.

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Date Created: 01/10/16
Ma128 notes 2.3 addition and subtraction of whole numbers Two models Set model Number line (measurement ) model Set model A + B= N(a intersection b) Let a and b be any two whole numbers if a and b are disjoint sets a=n (a) and b =N(b) N= number of elements in (set A) On the number line whole numbers are geometrically interpreted as distance. Properties of whole numbers Property examples 8+3 = 3+8 commutative ( 7+5) + 8 = 7+ (5+8) associative A million plus a contrillian is not infinite closure 2.1 subtraction of whole numbers Let a and b be whole numbers the differneces of a and b A-B is the unique whole number c a-b=c A= minuend B= subtrahend C= difference For models for subtraction  Take away  Missing addend  Comparison  Number line Ex: take away Joel has 10 cookies he gives 3 cookies to his sister. How many does joel have left? Ex: comparison Roger has read 9 books this week. His friend Jake has read 6 books this week. How many more books has rogers read then Jake. Ex: missing Sarah has saved $15 she needs $22 to buy a blouse she noticed last week. She noticed last week how much more money does she need to buy the blouse $15 + ? =22 Ex: number line Put arrowheads together for subtracting and draw the subtrahend arrow backwards from head to tail.


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