Home » Maths » Definition of Subtraction Definition of Subtraction What is Subtraction? Subtraction means taking away. We use the sign ‘-‘ for Subtraction. ‘-‘ means the sign of minus. We write it as: 7 – 3 = 4 We read it as 7 minus 3 is equal to 4. Minus shows subtraction or taking away. See More Math Links Addition Subtraction Multiplication Ascending Order Rotational Symmetry Line of Symmetry Fraction Prime Number Rational Numbers