3.4 Decimals and Percents (p.68-69)

I. Percent means "per hundred"
A. Percentages are another way to talke about having a fraction of the whole or part of a whole
1. If you have all of something you have 100%
2. A percentage is like dividing a whole into 100 equal parts then showing how many of those parts you have out of the 100.

II. Converting a decimal to a percent.
1. Move the decimal point two places to the right
a. this is the same as multiplying the decimal by 100 -> turning the whole from 1 equal part into 100 equal parts
2. Put a percentage (%) symbol at the end of the number

III. Changing a percent into a decimal
1. Remove the percent symbol (%)
2. Move the decimal point two places to the left
a. this is the same as dividing by 100 - turning the whole from 100 parts into 1 part

Try this matching game from Harcourt math.

3.3 Estimate with Decimals (p.66-67)

I. Decimals are fractions of a whole - they have relatively small values
A. It's often a good strategy to round decimals to whole numbers
B. Larger numbers = focus on larger place values: In larger numbers, you can even ignore the decimals and focus on rounding to the tens, hundreds, or larger place values.

II. Methods for estimating decimals are the same as for whole numbers**
A. Rounding
B. Compatible Numbers:
C. Clustering
**To review how to do these check the notes from lesson 1.2

Listen to another teacher explain a few examples on this glog from Ms. Seymour. Scroll down to the examples and click on the play button on the left side to learn through some examples.

3.2 Problem Solving: Make a Table (p.64-65)

I. Tables help you organize information and find or use patterns to solve problems.
1. Make sure you understand what you are being asked to find
2. Organize (and order) the information in a table
3. Look for a pattern or sequence
4. Solve the problem
5. Check to make sure you are answering the original question

3.1 Represent, Compare, and Order Decimals (p.60-63)

I. Order Decimals by following these 3 steps
1. Line up the decimal points.
2. Add zeros to make the number size the same
3. Compare numbers from LEFT to RIGHT (Watch this tutorial)

II. Examples of different ways to read and write numbers:
Standard form: 0.392
Expanded form: 0.3 + 0.09 + O.oo2
Word form: three hundred ninety-two thousandths

Watch this tutorial from math6.org and then try this quiz to check what you know. When you think you've got it figured out, try out this game.

Find the hidden treasure in "Attack of the Place Value Pirates" (warning this game involves sword fighting with pirates and may not be suitable for all students)