Scientific Calculator

How to use

1. Build a number with the keys 0 through 9 and the decimal point. Place ÷, ×, −, or + between numbers, then press =. C resets the display to 0.
2. ± flips the sign of the whole line. % immediately divides the current value by 100, so it converts a number to a hundredth rather than acting as a remainder key. π inserts pi, and if the line already ends in a digit it inserts a multiply first.
3. sin, cos, and tan treat the current value as degrees and replace the line with the result. log is base 10. ln is the natural log. √ replaces the line with the square root, and x² replaces it with the square. Those keys run at once, before you press =.
4. xʸ only appends **. Type the exponent and press =. If the line cannot be evaluated, the display shows Error and the stored expression is cleared.

When it helps

Use it to check a step that needs sin of 30 degrees, which is 0.5 here because the trig keys are in degrees, not radians. Square a measurement with x², or take a root with √, without an extra equals press.

A lone percent conversion is what the % key does. Comparisons such as what percent one score is of another belong on the percentage calculator. Keep an exact numerator and denominator on the fraction calculator. Change feet to meters, or hours to seconds, on the unit converter before you type, because this keypad has no unit menu.

Limits

Nothing on the keypad stores a number for a later recall, and there is no backspace. C wipes the entire line. ± applies to the whole expression, not only the last digits you typed. There is no parentheses key, so a sum that must happen before a multiply has to be evaluated in two steps. xʸ does not calculate by itself.

Square root of a negative, log or ln of zero or a negative, and tan of 90 degrees show Error. The = key rewrites ÷, ×, and −, then uses ordinary arithmetic precedence. Answers are floating-point values, so a repeating decimal is not kept as a fraction.