# Chapter 6 Math Test 2. txt

 Why do teachers teach concept development of addition and subtraction? to teach what it means and when it is appropriate Enactive Mode = Concept Development 1. problem needs to be solved2. manipulatives to use3. allow them to explore4. ask for questions to check for understanding Definition of Learning Basic Facts of Addition sum of two whole numbers less than ten (sum does not matter) Order of Teaching Basic Facts 1. sums less than 102. sums greater than 103. sums equal to 10 Same Sum Fact Family 1. all basic fact with same number answer2. all of the different ways you can show the number3. each time you find a different way, write down the number sentence Transitivity of Equality 1. discover process when using same sum fact family arrangement2. 5 + 1 = 4 + 2 Basic Fact of Addition Information 1. 100 basic facts of addition2. children only memorize 453. vertical format most helpful for memorization4. commutative property responsible for reducing Mental Math Strategies for Addition 1. Count On or Count Up 2. Near Doubles3. Make 104. Hidden Number Count On or Count Up Mental Math Strategy --must have addend of either 1 or 2 --child says larger addend then counts up Near Doubles Mental Math Strategy --two addends are consecutive numbers on the number line--children must memorize double facts first--use smaller number, then add one or use bigger number, then subtract one Make 10 Mental Math Strategy --sum is greater than 10 Hidden Number Mental Math Strategy --use this strategy when there is one whole number in between two addends--depend upon memorization of doubles facts Related Number Fact Families for Subtraction 1. three related numbers, two numbers are the addends and one of the numbers is the sum2. can write two addition and two subtraction sentences3. using just the terms, I can name all the fact families to relate to the commutative property Authoremilybrooke082690 ID77107 Card SetChapter 6 Math Test 2. txt DescriptionMath Test Two Chapter Six Updated2011-04-04T03:36:22Z Show Answers