TOPICS
This page:
algebra
Search
Dr. Math
See also the
Dr. Math FAQ:
order of operations
Internet Library:
basic algebra
T2T FAQ:
algebra help
MIDDLE SCHOOL
About Math
Algebra
equations
factoring expressions
graphing equations
Arithmetic
division
exponents
factorials
factoring numbers
fractions/percents
logarithms
Definitions
Geometry
2dimensional
conic sections/
circles
triangles/polygons
3D and higher
polyhedra
History/Biography
Logic
Measurement
calendars/
dates/time
temperature
terms/units
Number Sense
factoring numbers
negative numbers
pi
prime numbers
square roots
Probability
Puzzles
Ratio/Proportion
Statistics
Word Problems

Browse Middle School Algebra
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
Direct and indirect variation.
Inequalities and negative numbers.
Positive/negative integer rules.
Solving simple linear equations.
 Why Do We Use Variables in Algebra? [01/31/2004]

Why do we use letters to represent numbers in algebra?
 Why Factor? [08/18/2001]

I've been explained the how's, the where's, the what's, but not the WHY.
What is the practical use of factoring?
 Why Flip the Inequality Sign? [10/26/2001]

Please tell me why you flip the inequality sign when dividing by a
negative number.
 Why FOIL? [11/21/2002]

How can I explain to the class the importance of learning FOIL?
 The Why of Algebra [11/13/1998]

What is algebra for? Why do you need the letters and variables?
 Why Order of Operations? [5/17/1995]

7thgraders wonder why we use the order of operations at all. Why not
just set up problems to read from lefttoright? Can you suggest some
"reallife" examples that show the necessity of using the order of
operations?
 Why Some Solutions to Absolute Value Equations are False [10/24/2004]

When solving equations involving absolute value, you sometimes get an
answer that doesn't check in the original equation. What is it about
absolute value that makes this happen?
 Why Use Letters in Math? [12/01/1999]

Why do we need to use letters in math?
 Why Use n for Any Number? [09/28/2002]

Why do people use n when any number can fit in or when they want to
indicate position?
 Why Use Variables? [06/01/1999]

What is the point of using variables when you could use numbers?
 Why Use X and Y for Variables? [10/23/2002]

Why do we use x and y for variables in an equation?
 Writing Equations for Word Problems [09/01/1998]

Can you help me convert the following word problems to equations and
solve them? An oil painting is 16 years older than a watercolor ....
 x  8 = 5 [06/13/2001]

I know the answer but our teacher wants us to show all of our work and
add something to both sides.
 Young's Formula [08/21/1999]

Calculating a child's dose of medicine based on the adult dose.
Page: [<prev]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
