The knowledgebase is a categorized collection of answers to frequently asked questions (FAQ) and articles. You can read articles in this category or select a subcategory that you are interested in.
FAQ: Undefined and indeterminate expressions
Many students struggle with the ideas of division by zero and the zeroth power. Is the value zero, or infinity; or is it undefined, or something else? Sometimes these are called undefined or indetermi... 

FAQ: Fractions, decimals, percentages, and rational numbers
How do you work with fractions and decimals? See these pages in Ask Dr. Math: Fractions, Decimals, and Percentages, Dividing Fractions How about that special d 

FAQ: Permutations, Combinations, and Probability
For information about permutations, combinations, and probability, see these pages in Ask Dr. Math: Permutations and Combinations Introduction to Probability 

FAQ: Special numbers: pi, e, phi, ...
For information about special numbers, see these articles in Ask Dr. Math: pi = 3.14159... e = 2.71828... 

FAQ: Number representations
For information on numerals and ways to represent a number, see these articles from Ask Dr. Math: Number Bases Roman Numerals 

FAQ: Factors and Primes
For information related to factoring numbers, see these articles in Ask Dr. Math: Divisibility Rules Learning to Factor (numbers and polynomials) 

FAQ: Operations
Order of Operations Multiplication Facts Negative × N 

FAQ: Word problems
Word Problems Distance, Rate, and Time Working Togeth 

FAQ: Proofs
Proofs (in Geometry) Fermat's Last Theorem False Proofs, Classic Fal 
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