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.
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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:
- Understand the problem
- Develop and carry out a plan
- Find the ANSWER and CHECK!
Math-8: Chapter 5 Test!