Texas Instruments Online Calculator

Two very different machines get searched for under the same name. A TI-30X-style scientific calculator handles powers, roots, logs, trig, scientific notation and fractions on a one- or two-line display. A TI-84-style graphing calculator adds plotting, tables, lists and statistics on a full screen.

This tool covers the scientific side and shows the working rather than just the number — which is the part a handheld cannot do. It runs in the browser, so nothing is installed and there is no exam-mode lockout to worry about; equally, it is an internet tool, so it is not a substitute for an approved calculator in a test that requires one.

AI-Math is not affiliated with, endorsed by, or connected to Texas Instruments. TI, TI-30X and TI-84 are that company's product names, used here only to describe the kind of calculation people are looking for.

• Negation vs subtraction. The $(-)$ key makes a number negative; the $-$ key subtracts. They are not interchangeable, and swapping them is the single most common syntax error.
• $-3^2$ is $-9$. Exponents bind tighter than the minus sign, so the calculator squares $3$ first and then negates. For $9$ you must type $(-3)^2$.
• Implied multiplication is not implied. $2(3+4)$ may need an explicit $\times$; without it some models parse it differently.
• The EE key means "times ten to the". For $2.5 \times 10^{3}$ press 2.5 EE 3. Typing 2.5 x 10 EE 3 gives ten times too much.
• DEG vs RAD. $\sin 30° = 0.5$, but in radian mode $\sin 30 \approx -0.988$. If a trig answer looks wildly wrong, check the mode indicator before anything else.

A calculator applies PEMDAS exactly, with no sympathy for what you meant. $8 \div 2 \times 4$ evaluates left to right as $16$, not $1$. A division bar in a textbook is an invisible bracket, so $\frac{7+5}{3}$ must be typed as $(7+5) \div 3$ — leaving the brackets out gives $7 + 1.\overline{6}$.

Other habits worth having:

• Answer reuse. The Ans key inserts the previous result, which avoids retyping a long decimal and losing precision to rounding.
• Fraction entry. A fraction key keeps $\frac{2}{3}$ exact instead of $0.6667$; use it whenever the expected answer is a fraction.
• Round only at the end. Carry every digit through the intermediate steps and round once, on the final line.