mathsisfun.com
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MathsIsFun is a beginner-friendly math learning site that explains core concepts with clear, step-by-step tutorials and interactive activities. It covers decimals (place value, operations, conversions) along with other topics and offers practice problems, worksheets, and quizzes to reinforce understanding.
More resources on Decimals
Khan Academy Decimals
Interactive free lessons and exercises, top Reddit rec in r/learnmath
Pre-Algebra: Decimals
Learn decimal operations, conversions, and problem-solving with this free pre-algebra course by Sal Khan. Master decimals now!
khanacademy.org
Khan Academy is a free online learning platform with instructional videos, practice problems, and personalized progress tracking across many subjects, including math topics like decimals. It offers step-by-step decimal lessons, interactive exercises, quizzes, and mastery-based pacing to help learners master decimals.
Pre-Algebra
Pre-Algebra - A book resource
mathworld.wolfram.com
Wolfram MathWorld is a comprehensive online math encyclopedia with in-depth articles on decimals and other math topics, offering clear definitions, formulas, explanations, and worked examples.