How to Calculate Basic Arithmetic

Step-by-step

1. Write the expression clearly.
2. Use brackets to make intended grouping explicit.
3. Enter the expression into the calculator.
4. Review the result and confirm the operation order.
5. Estimate the expected range to catch obvious input errors.

Order of operations

Brackets and multiplication or division can change how an expression is evaluated. When an expression is ambiguous, add brackets instead of relying on assumptions.

Check division

Division by zero is undefined in ordinary arithmetic. If a result is unexpected, check the divisor and the placement of decimal points or negative signs.

Expressions to try

2 + 3 * 4 is 14, because multiplication comes before addition. (2 + 3) * 4 is 20, because the brackets change the order.

200 * 15% is 30. In the Number Calculator, a % after a number divides it by 100, and 2 ^ 10 gives 1,024.