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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]
7th-graders wonder why we use the order of operations at all. Why not just set up problems to read from left-to-right? Can you suggest some "real-life" 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.

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