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Lawrence Hall of Science
The Math Page: Skill in Arithmetic: The Meaning of Subtraction, and Mental Calculation
This website explains and defines basic subtraction. There are practice problems at the very end of this lesson.
Curated OER
Minuend Subrahend Image
Use this interactive site from Visual Fractions to practice subtraction with fractions on a number line. You will receive immediate feedback on your answers.
Mr. Martini's Classroom
Mr. Martini's Classroom: Subtraction: Fill in the Blank
Students fill in the blanks to solve subtraction fact problems on these interactive flashcards. The problem changes color when the correct number is typed.