Subtraction Calculator Difference between two numbers. a b a − b 45 Step-by-step with your numbers: 1. Values used: 2. a = 100 3. b = 55 4. a − b = a - b = 100 - 55 = 45 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! Simple subtraction. FAQ Negative? If b > a, the result is negative. Related calculators Addition Calculator Sum of numbers. Multiplication Calculator Product of two numbers. Division Calculator Quotient of two numbers.