khanacademy.org
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Khan Academy is a free online learning platform offering comprehensive math instruction through instructional videos, interactive practice, and quizzes, including lessons on integers.
More resources on Integers
Khan Academy: Negative numbers
Arithmetic review of negative numbers and integers
Math is Fun: Integers
Clear explanations and examples for integers
mathsisfun.com
MathsIsFun is a free online math resource with kid-friendly, clear explanations and examples across topics from basic arithmetic to algebra and geometry. It offers topic pages (including integers), interactive tools, worksheets, and plenty of practice problems to reinforce understanding.
sosmath.com
SosMath is a free online math help resource offering step-by-step tutorials, worked examples, and practice problems across topics such as algebra, geometry, trigonometry, calculus, and linear algebra.