Arcademics
Arcademics: Four Wheel Fracas
Multiplayer math game where four wheelers race by solving algebra one-step addition and subtraction problems.
OnlineMathLearning.com
Online Math Learning: Adding & Subtracting Positive & Negative Decimals
An interactive worksheet for practice in the addition and subtraction of decimals with positive and negative signs.
Better Lesson
Better Lesson: Hopping Up & Down the Number Line
SWBAT identify the subtraction and addition sign and understand their function by hopping a bunny up and down a number line.
Texas A&M University
Wtamu Virtual Math Lab: College Algebra: Adding & Sub. Rational Expressions
Rational expressions have never been so easy! Use this site to learn how to add and subtract them with ease and confidence. And common denominators? No Problem! Great practice problems are included to see how much you've learned.