MATH SKILLS AND VOCABULARY 2013 Review of Essential Skills as they are taught; content determined by Atlas/Common Core standards

Ways We Name Numbers (1-3)  Standard Form  Expanded Form  Word form  Place Value Block Form  Ordinal Form

Place Value (1-1) Ones, tens, hundreds, thousands, ten thousands, hundred thousands Our number system is grouped into periods: Hundreds period Thousands period

How do we COMPARE NUMBERS? (1-5) Greater Than: 345>335 Less Than: 567<467 Equal To: 10 tens = 100 When we compare numbers, we start by comparing the greatest place values.

Properties (RULES) of Addition Commutative property of addition: 6+7=7+6 Therefore, 8+?=9+8 Identity property of addition: the identity of a number does not change when you add 0. 8,975+0=8,975 Associative Property of Addition: It does not matter which numbers are associated, or grouped, together. (7+9)+6=7+(9+6) Therefore, 9+(5+4)=(?+5)+9 *Brain Pop: properties of addition ommutativeproperty/preview.weml

More samples of addition properties:

MONEY$___.___ ___ (The decimal separates the dollars from the cents!)  When we count money, we always order the money from _________ value to __________ value.  Practice: Show 3 different ways to make 59 cents. How do you calculate change? $5.00what you give the clerk - $2.29What the store gets to keep Your change What characteristics do each of the coins have?

Part, Part, Whole diagram 7525 ? 7 ? 10 Can you make number sentences using the “Part Part Whole” diagrams above?

What in the world is a NUMBER sentence? A sentence is a group of words that are a complete thought. A NUMBER sentence also states a complete thought Examples of NUMBER sentences: 4+5=25 (notice when you read this that it has a subject and predicate, just like a sentence!) 20+4=24 5x6=30 NOT NUMBER sentences :  867 (missing a predicate- what about 867?)  9,345 Which of the following number sentences are true? 30+4=34301=310 2 tens > one ten and nine ones$1.25> 125cents 12,200=10,000+2,

Rounding and Estimating Numbers (2-4) Rounding When we round we find the closest tens, hundreds, or thousands number. Estimating When we estimate, we ROUND FIRST and then add or subtract.

NUMBER LINES: Who needs them? (1-5A) Number lines are used to compare numbers. Number lines do not always count by ones! As a matter of fact, they rarely do. Look closely to see if a number line is counting by 2s, 5s, 10s, or even 100s!

Regrouping in Addition Place value plays a very important roll in addition. Be sure to regroup the numbers into their proper place if your sum of one place value is more that one digit.

Determining if something is REASONABLE: (3-5) If you ask your mom if you can have two Oreos, you are being reasonable. If you ask your mom if you can eat 100 Oreos, you are being unreasonable. The word REASONABLE means the same thing in math. “Reasonable”- means that something “makes sense” Is it reasonable that is ABOUT 100? Why or why not? Is it reasonable that is ABOUT 300? Why or why not?