1.6 Addition and subtraction of rational numbers
1.6 a) The book gives 90 as an example.
168
Step 1 find all of the prime factors for 90 and for 168
90 = 3,3,2,5
168 = 2,2,2,3,7
step 2 cross off the prime numbers that are the same one of each. for example 2 = 1 so they
can be crossed off. So the equivalent fraction is (3)(5) = 15 2
(2)(2)(7) 28
When I say equivalent fractions I mean 90 divided by 168 equals 15 divided by 28. if you
put it in a calculator you get exactly the same number for the two division problems.
1.7
Web pages to build your skills:
Math practice
pre Algebra is in the 8th grade link and then after that it is labeled by class. Algebra 1, Algebra 2 etc...
Finding lowest common multiple:
.factmonster.com/
chapter 1 Review:
This is an open book: pre-Algebra eBook that explains the math steps very clearly.
Go through it practice it:
http://home.comcast.net/~cherylwilcox1/site/
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