Mary A. Steltz

7th Grade Math - Room 501

Knox Middle School

1625 Park Road West

Salisbury, NC 28144

704-633-2922, Ext. 501

Planning:  11:45a - 1:15p Daily

November 23-24, 2009

Remember:  Students will attend Tuesday from 8:00a - 12:45p!!

 http://www.proprofs.com/flashcards/cardshow.php?title=Larry-Bells-12-Powerful-Words-1&quesnum=4

Welcome back to Week 12 at Knox Middle School!  This week we will continue Objective 1.01 -    Develop and use ratios, proportions, and percents to solve problems.  We will wrap up our lessons on percents.  We are also implementing Larry Bell's 12 powerful words and UNRAAVEL into all classes!  This initiative is proven to raise test scores and close the achievement gap!!  To learn more, you can visit Larry Bell's website at http://www.larry-bell.com.  My students have created a cheer for our math class, based on UNRAAVEL - How to solve a math problem:

U - Use your eyes (Underline the question)

N - Now you decide (Now predict how you will solve the problem.  Multiplication, division, addition or subtraction)

R - Right or lame (Read the entire problem)

A - Apply your game (Are the important cue words circled)

A - Analyze, identify (Apply the steps to solve the problem)

V - Verify, please verify (Verify your answer to see if it's reasonable)

E - Evaluate your correction (Eliminate the wrong answers)

L - Look at your selection (Let your answer stand or rework the problem)

U - N - R - A - A - V - E - L!!

MESSAGE TO PARENTS

Please check your child's agenda for homework assignments, tests, and upcoming events!   

7th Grade Math 

In accordance with the North Carolina Math Pacing Guide – Grade 7 (2009-2010), we will utilize the Holt Middle School Math, Course 2 Text Book for the North Carolina Course of Study.  Following are the topics we will cover:  Data Analysis, Number Sense and Algebraic Reasoning, Operations and Equations with Integers and Rational Numbers, Proportional Reasoning, Percents, 2-Dimensional and 3-Dimensional Geometry, Probability, Solving Equations and Inequalities, Functions & Sequences.  The course is required for graduation and does have an End of Grade test.  We will have fun and learn at the same time! 

Congratulations to November Students-of-the-Month!!!!

HOMEWORK HELP

I have given students my email address for additional support, and they are allowed to work in their assigned study groups.  Please check your child's notebook for notes from class that will provide examples and assistance to them.  Every homework assignment is reinforcement for what I have modeled and demonstrated in class!                   

Converting Fractions to Percents

To change a fraction to a percent, divide the denominator into the numerator.  The result will be a decimal.  Set the decimal over 100 to get a percent.  Example:  1/4 = .25 so 25/100 = 25%!  See visual example below!!

The Relationship Among
Fractions, Decimals, Percents:

All represent a part of a whole

• A fraction is based on the number into which the whole is divided (the denominator).  The numerator (the top) is the PART, the denominator (the bottom) is the WHOLE.
• A decimal is based on the number in terms of tenths, hundredths, thousandths, etc.
• A percent is based on the number in terms of 100.
  

Example:    

Fraction              Decimal              Percent

            1/2                        .50               50/100=50%

How do we get from one form to another?

1. Fraction to Decimal

Divide the denominator (the bottom of the fraction) into the numerator (the top of the fraction). Place a decimal point after the number inside the division "box" and attach as many zeros as necessary to handle the division.  If the quotient does not come out evenly, follow any rounding instructions.

2. Decimal to Percent

Move the decimal point two places to the right (this multiplies the number by 100).

.50 = 50%

(0.50 x 100 = 50.0  Attach the percent sign: 50%)

3. Percent to Decimal

Move the decimal point two places to the left (this divides the number by 100).

50% = .50

4. Percent to Fraction

Place the number in the percent over 100 and reduce. 50% = 50/100 = 1/2

5. Fraction to Percent

Multiply the fraction by 100, reduce, and attach a percent sign.

     1/2 x 100/1 = 100/2 = 50%

6. Decimal to Fraction

You will be using place value to do this one!   Count the decimal places of the decimal starting from the decimal point. If there is one decimal place, place the number over 10 and reduce. If there are two decimal places, place the number over 100 and reduce. If there are three decimal places, place the number over 1000 and reduce.  (This is really just using your knowledge of place value to name the denominator!)

0.5 = 5/10 = 1/2

Remember that fractions, decimals, and percents are discussing parts of a whole, not how large the whole is.

Fractions, decimals, and percents are part of our world. They show up continuously when we least expect them. Don't let them catch you off guard.

Start with this word problem:

What number does 80% of 19 equal?

Remember, "of" always means you must multiply: 80% of 19 is 80% times 19 (80% ´ 19). What number does 80% times 19 equal? Put a blank for "what number."

80% x 19 =

Before you can work this problem, change the percent number. You can change it into a fraction or into a decimal number. A decimal will be easier to work with. What decimal number equals 80%? The decimal number is 80 hundredths (.80).

.80 x 19=

Now multiply 80 hundredths times 19 (.80 ´ 19). The answer is 15 and 2 tenths (15.2). So 80% of 19 equals 15.2. 

• What is 35% of 80?

Here we have the rate (35%) and the original number (80); the unknown is the comparative number which constitutes 35% of 80. Since the exercise statement is "(some number) is (thirty-five percent) of (eighty)", then the variable stands for a number and the equation is:

x = (0.35)(80)

x = 28

Twenty-eight is 35% of 80.

 

HAPPY THANKSGIVING EVERYONE!!