Basic Calculator
Add, subtract, multiply, and divide with visual explanations
29
About this calculator
A visual basic calculator for addition, subtraction, multiplication, and division. See your arithmetic operations illustrated with interactive diagrams that help you understand the math behind the answer.
How to use the basic calculator
- Type your first number into the First number field.
- Pick an operation: add, subtract, multiply, or divide.
- Type your second number into the Second number field.
- Read the answer at the bottom and the matching visual above it.
Common examples
- 12 + 8 = 20
- 45 - 17 = 28
- 6 × 7 = 42
- 144 ÷ 12 = 12
- 25.5 + 4.5 = 30
Frequently asked questions
What operations does this basic calculator support?
Addition, subtraction, multiplication, and division. Both operands accept signed decimal numbers, so you can compute results like -3.5 + 2.25 or 144 ÷ -12 directly.
What happens when I divide by zero?
Dividing a nonzero number by zero is undefined and the calculator shows a friendly division-by-zero message instead of a numeric result. The special case 0 ÷ 0 is shown as indeterminate.
Can I share a calculation with someone else?
Yes. Every input updates the URL, so copying the address bar and sharing the link reopens the exact same calculation with the same numbers and operation.
Why is there a visual under the result?
The visualization (number line, bars, or grouped blocks) shows what the operation is doing geometrically. For negative or non-integer values the visual switches to a number-line view to stay accurate.