Monthly Archives: March 2007

Pre-Algebra: Chapter 9 Review We did the Chapter 9 Form 1a version of the test. Make sure that you have all your problems done and questions answered. The TEST is MONDAY! Algebra: Chapter 10, Lesson 9 Dividing Polynomials See yesterday’s … Continue reading →

MrE is at a CABE (Californian Association of Biligual Educators) Conference today and tomorrow, he will be back in class on Monday! Pre-Algebra: Chapter 9 Review It’s time to review Chapter 9! We should be able to: Write fractions in … Continue reading →

Pre-Algebra: Chapter 9-10 Percent of Change We have a simple formula for percent of increase or percent of decrease. We use: (new value – old value) ÷ (old value) to find the percentage change. If the percent change is NEGATIVE, … Continue reading →

Pre-Algebra: Chapter 9-9 Using Percent Equations Some definitions are in order. Discount is the amount that we save when something is on sale. Interest is the amount of money that you earn when you lend your money to the bank. … Continue reading →

Pre-Algebra: Chapter 9-8 Percent and Estimation To estimate percent, round the percent to the nearest 100, 10, 5 or some multiple of 5 or 10 (usually). Just give it your best shot, in that estimates are just approximations. Remember, to … Continue reading →

Pre-Algebra: Chapter 9-7 Fractions, Decimals and Percents Using D2P and the whickity-whack divide thingy, you can solve any conversion from fractions to decimals to percentages or any combination thereof. Remember that X% stand for X ÷ 100 and you’ll be … Continue reading →

Pre-Alegbra: Chapter 9-5 Using the Percent Proportion If P is the percentage and B is the base and the rate is called R, then P / B = R. If R represents the number per hundred, this equation becomes P … Continue reading →

Pre-Algebra: Chapter 9-5 Using the Percent Proportion We know how to convert fractions to percentages. Remember D2P, it stands for decimal to percentage. To convert from decimals to percentage, we move the decimal from left to right 2 decimal places. … Continue reading →

Pre-Algebra: Chapter 9-4 Using Proportions You can use a proportion to solve problems that relate to ratio. You can use the criss-cross method to solve these type of problems, a/b = c/d or criss-crossing, we can say that a*d = … Continue reading →

Pre-Algebra: Chapter 9-3 Simple Probability Probability is the chance some event will happen. It is the ratio of the number of ways an event can occur to the number of possible outcomes. In an equation then, Probability = number of … Continue reading →