ADDITION and SUBTRACTION
Adding and Subtracting Fractions: o Find a least common denominator using method for LCM
o Change the numerators of each fraction
o Add or subtract the numerators (keep denominator unchanged)
1. In Decimal Form
0.4443252 ____ 0.4433324
3.44 ____ 3.442
1003 _____ 1030
0.332 _____ 1.0004
2. In Fraction Form
a. Express both numbers as fractions – proper or improper
b. Find the common denominator
c. Express both fractions as equivalent fractions over the common
d. Compare the numerators if and only if a <
Summary: We now have the rational numbers, and we can
perform all four operations
with them and get a rational number answer. So, we have all the numbers we
OR DO WE???
Problem 1: Given a square with sides of length one inch,
how long is the diagonal?
Problem 2: Find the ratio of the circumference of a circle
to its diameter.
Neither of there two problems have answers that are
We need more numbers to describe REAL PHYSICAL LENGTHS.
Irrational Numbers are real numbers (real points on the
number line ) that CANNOT be
expressed as a ratio of two integers (fraction).
Examples: pi, the square root of 2, ..
We will work with square roots in this class. Other
classes will introduce you to other
Start solving your Algebra Problems
in next 5 minutes!
Download (and optional CD)
Click to Buy Now:
2Checkout.com is an authorized reseller
of goods provided by Sofmath
Attention: We are
currently running a special promotional offer
for Algebra-Answer.com visitors -- if you order
Algebra Helper by midnight of
you will pay only $39.99
instead of our regular price of $74.99 -- this is $35 in
savings ! In order to take advantage of this
offer, you need to order by clicking on one of
the buttons on the left, not through our regular
If you order now you will also receive 30 minute live session from tutor.com for a 1$!
You Will Learn Algebra Better - Guaranteed!
Just take a look how incredibly simple Algebra Helper is:
: Enter your homework problem in an easy WYSIWYG (What you see is what you get) algebra editor:
Step 2 :
Let Algebra Helper solve it:
Step 3 : Ask for an explanation for the steps you don't understand:
Algebra Helper can solve problems in all the following areas:
simplification of algebraic expressions (operations
with polynomials (simplifying, degree, synthetic division...), exponential expressions, fractions and roots
(radicals), absolute values)