
Mathematics and Logic  Cameron Counts
Apologies: this will be a long post, and there will be more to come. But it may be useful to you if you are getting to grips with logic: I have tried to keep the overall picture in view.
https://cameroncounts.wordpress.com/2010/01/03/mathematicsandlogic/

Math Logic and Math Problems  Accredited Online College Degrees
Math Logic and Math Problems from accredited online degrees.
http://www.accreditedonlinecollegedegrees.com/mathlogicproblems.html

Critical Thinking and Logic in Mathematics  Study
Logic has its own unique language and way of defining what is true and false. Watch this video lesson to learn how you can critically think in the language of logic while working with math.
http://study.com/academy/lesson/criticalthinkingandlogicinmathematics.html

A+ Click Math Problems and Logic Puzzles
AplusClick math problems, games, logic puzzles on numbers, geometry, algebra, word problems. Skills test for grades K1 K12.
http://www.aplusclick.com

Math Logic Games  Math Play Ground
Math Playground has more than 350 Logic Games, strategy puzzles, and thinking games that will give your brain a workout. Play Bloxorz, Sugar Sugar, Snail Bob 2 and all your favorite thinking games. Games are free to play. Math Playground provides a safe place for kids to explore logic and problem solving online.
http://www.mathplayground.com/logicgames.html

Beginning Rigorous Mathematics/Basic Logic  Wikibooks
In the previous chapter we made clear what a logical statement is. In this chapter we will define and derive rules for working with compound logical statements.
https://en.wikibooks.org/wiki/Beginning_Rigorous_Mathematics/Basic_Logic

Mathematical Logic  Wikipedia
Mathematical logic is a subfield of mathematics exploring the applications of formal logic to mathematics.
https://en.wikipedia.org/wiki/Mathematical_logic

Foundations of Mathematics  Britannica
The study of the logical and philosophical basis of mathematics, including whether the axioms of a given system ensure its completeness and its consistency.
http://www.britannica.com/topic/foundationsofmathematics

Foundations  Algebra Basics  Khan Academy
This topic isn't algebra, but it is a survey of all of the most important prealgebra skills you need to really digest algebra. These skills also tend to be pretty important in life in general!
https://www.khanacademy.org/math/algebrabasics/corealgebrafoundations

Foundations Of Mathematics  Wikipedia
Foundations of mathematics is the study of the logical and philosophical basis of mathematics, or, in a broader sense, the mathematical investigation of what underlies the philosophical theories concerning the nature of mathematics.
https://en.wikipedia.org/wiki/Foundations_of_mathematics