Using the standard calculator accurately
This calculator handles everyday addition, subtraction, multiplication, and division. You can use it for a single calculation or a short sequence of operations, and keyboard input can make repeated arithmetic quicker.
Check the order of operations
When an expression includes multiple operations, multiplication and division normally take precedence over addition and subtraction. For example, 8 + 2 × 5 = 18, while (8 + 2) × 5 = 50. Use parentheses to show which part should be calculated first instead of relying on a reader—or a calculator—to guess the intention.
Rounding and division
A displayed decimal can be a rounded representation of the internal result. If a calculation feeds into another calculation, keep the full available precision until the final step when possible. Division by zero is undefined, and extremely large values may exceed a display's useful precision.
For work that depends on a particular unit, include that unit in your notes: the calculator returns a number, not a unit conversion. Double-check signs, decimal points, and parentheses before using an answer in a financial, construction, or science context.
Tips for accurate results
This works like a basic handheld calculator. Many basic calculators evaluate operations in the order you press them, which differs from written mathematics where multiplication comes before addition. For expressions that mix operations, enter parts separately or use the scientific calculator with parentheses.
Common mistakes and limits
Percent keys behave differently across devices, so double-check results for markups and discounts. Rounding and long decimals can hide small errors, and a mistyped digit is the most common reason for a wrong answer.