Days 67 and 68

Day 68

Algebra: Chapter 8-3 and 8-4 Review, pages 367 and 373 (Monday, January 14)

We reviewed all the homework problems from Chapter 8-3 and 8-4. Today was a day to ask questions and to make sure that we know how to solve simultaneous equations using substitution or addition and subtraction.

Math-8: Chapter 6-1, p 274

Writing Fractions as Decimals

All we have to do is remember “D2P”, decimal 2 (to) percent”. To change a decimal to percent, just move the decimal place 2 places to the right and to change a percent to decimal, move the decimal 2 places to the left.

To convert a fraction to a decimal, divide the denominator INTO the numerator and remember that the % symbol stands for `1/100`. For example 45% is `45/100`. Remember though that you have to reduce as well when possible. In our example `45/100` becomes `9/20`.

For mixed numbers, first convert them to improper fractions. From here, you can do anything you want. Treat the improper fraction as a normal fraction for conversion to decimals or percentages.

<HR WIDTH=60% ALIGN=center>

Day 67

Algebra: Chapter 8-4, p 373 (Friday, January 11)

Using Sytems of Equations

“Systems of 2 equations with 2 variables are often used to solve problems. When you use 2 variables, you must remember to write the 2 equations in order to have one solution. After a problem is translated to a system of equations, you must decide whether to use the substitution or addition/subtraction method.”

Steps to follow:

  1. Understand the problem
  2. Develop and carry out a plan
  3. Find the ANSWER and CHECK!

Math-8: Chapter 5 Test!

No homework!

This entry was posted in Algebra 1, Math 8. Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *