Download Algebra I For Dummies (For Dummies (Math & Science)) by Mary Jane Sterling PDF

By Mary Jane Sterling

I wanted a brief refresher simply because i'm task looking and this occasionally comes up on interviews because of my career. I havent needed to use this kind of math for fairly your time although. I dont disagree even if with a few reviewers who've complained that the fabric just isn't written for newbies. I needed to fight with a lot of the e-book and needed to cross over sure chapters greater than as soon as. additionally, there's not approximately sufficient clarification of yes key suggestions. you're anticipated, for instance, to simply accept advanced equation is an equation with an influence no more than 2 during which the equation is determined to equivalent 0. but the accompanying workbook was once a good support; actually, there's simply enough clarification of every thought in every one bankruptcy of the workbook that i may virtually suggest deciding to buy the workbook in addition to the most textbook. in any case, although it was once a fight every now and then, i used to be capable of train myself algebra from this publication, and used to be in a position to take my placement examination with a passing grade. Like another commenters. i purchased this booklet simply because i'm searching for a brand new task 2 years after leaving my previous one, and was once instructed that I can be able to resolution questions about it. i used to be panicked, simply because i used to be by no means a powerful math scholar and have not taken a math classification in additional than 20 years.

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Additional resources for Algebra I For Dummies (For Dummies (Math & Science))

Example text

You can’t just add the numerators and the denominators. But the larger denominator, 4, is a multiple of the smaller denominator, 2. So your common denominator is 4. Rewrite the fraction by multiplying by . indd 46 of an hour (or 1 hour and 15 minutes). 4/16/10 11:04 AM Chapter 3: Figuring Out Fractions and Dealing with Decimals In her will, Jane gave of her money to the Humane Society and 47 of her money to other charities. How much was left for her children’s inheritance? and The fractions aren’t compatible.

Subtracting signed numbers Subtracting signed numbers is really easy to do: You don’t! Instead of inventing a new set of rules for subtracting signed numbers, mathematicians determined that it’s easier to change the subtraction problems to addition problems and use the rules I explain in the previous section. Think of it as an original form of recycling. Consider the method for subtracting signed numbers for a moment. Just change the subtraction problem into an addition problem? It doesn’t make much sense, does it?

So a positive times a negative is a negative. How about dividing? You and three friends decide to buy another friend lunch. 64. How much does each person chip in? 91 is what each of you contributes. When multiplying and dividing two signed numbers, if the two signs are the same, then the result is positive; when the two signs are different, then the result is negative. (+a) × (+b) = +ab (+a) ÷ (+b) = + (a ÷ b) (+a) × (–b) = –ab (+a) ÷ (–b) = – (a ÷ b) (–a) × (+b) = –ab (–a) ÷ (+b) = – (a ÷ b) (–a) × (–b) = +ab (–a) ÷ (–b) = + (a ÷ b) Notice in which cases the answer is positive and in which cases it’s negative.

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