1.4 Multiplication and Division

Here is a link to our text book's website that explains HOW TO MULTIPLY 2 DIGIT NUMBERS - or in Espanol

Here is a link to our text book's website that explains HOW TO DIVIDED 3 DIGIT NUMBERS. or in Espanol.

Additionally, if you are having trouble with dividing, check out this link with an explanation on how to do long division.

Check your understanding on these quizzes to see how you are doing with multiplication and division.

1.3 Addition and Subtraction (p.22-23)

Today's lesson was review of adding and subtracting large numbers and estimating to check our answers. If you are having trouble remember how to add and subtract you can read about it below.
Click here for help with Addition and Subtraction

If you want to practice some addition and subtraction games try these links.
Math Baseball
Mathcar Racing

1.2 Estimate with Whole Numbers (p.18-21)

• An estimate is a value close to the exact amount
• An estimate should be easier to find than an exact number
• An estimate is quick way to get an idea of about "how much"

I. Ways to Estimate

1. Estimate by ROUNDING: Choose a place to round to-- use the digit to right of the chosen place-- if the digit to the right is 5 or more "raise the score"-- if the digit to the right is 4 or less "let it rest"--numbers to the right of the place being rounded become zeros. If you are have trouble rounding watch the video at this from Math Playgroud
   


2. Estimate by CLUSTERING (when adding): When adding values that are close together, use one number to represent the values and then multiply that number by the quantity of values that have been clustered together.


3. Estimate by using CONVENIENT NUMBERS (when dividing): Use a value close to the original number that can more easily be divided to get an estimate.

II. Types of Estimates

1. Underestimating: When the estimate is less than the exact number - happens when you turn the original number(s) into a smaller value.
2. Overestimating: When the estimate is more than the exact number - happens when you turn the original number(s) into a larger value.

Here is Wikianswers

Practice what you learned about estimation at this site

1.1 Place Value ( p.16-17)

I. The Value of a digit is determined by its position in a number
Ex. 379,421: the value of the 7 is 7 x 10,000
**The of power of zero: 0 is a place holder

II. Place Value Chart
A. Organized into “Periods”
1. A Period is three (3) places
2. Periods are separated by commas (,)
a. When you get to a comma you say the name of the period








III. Writing Numbers
A. Standard Form: 4,927
B. Expanded Form: 4,000 + 900 + 20 + 7 = 4,927
C. Word Form: four thousand, nine hundred twenty-seven

Practice what you learned about place value at Funbrain