Two-Line Calculator
A free scientific calculator for the board that works like the TI-30XIIS. Students see a large copy of the screen and every key you press, so they can follow along on their own calculators.
- Free
- Scientific calculator
- Grades 6–12
- Smartboard
- No sign-up
Show the class the exact keys to press
Students who use a TI-30XIIS at their desks get stuck on the keys, not the math: where the square root is, how to enter a mixed number, how to get back to the last entry. The Two-Line Calculator has the same layout, the same 2nd functions and the same menus, so the steps you show on the board are the steps students press. On a wide screen it adds a projector panel with a large copy of the display and a running list of every key you pressed, line by line.
How the Two-Line Calculator works
Open it on the board
The first time it opens, the calculator shows a few worked examples, such as 5 1/6 + 1 1/10 = 14/15. Press CLEAR to start your own calculation.
Press 2nd for the blue labels
Each key has a second function printed in blue above it, like √ above x² and F◂▸D above PRB. Press 2nd, then the key. The display shows 2nd until you do.
Pick from menus
PRB, DRG, STO▸, DATA and STATVAR open a menu on the top line. Move with ◀ and ▶, then press = to choose. CLEAR leaves the menu.
Go back to past entries
▲ and ▼ bring back earlier entries. Press ◀ or ▶ to edit one, then = to work it out again, so a class can change one number and compare answers.
What's in the Two-Line Calculator
A projector panel students can follow
On a wide screen, like a smartboard, the projector panel sits beside the calculator. It shows the display in large print and lists the keys you pressed as keycaps, one calculation per line, with older lines faded. Students copy the sequence onto their own calculators. Turn the panel on or off from the top bar, and press Clear list to start a fresh list.
Fractions, statistics and memory
Enter mixed numbers with A b/c and switch an answer between a fraction and a decimal with 2nd F◂▸D. Enter one-variable or two-variable data with DATA, then read n, the mean and the standard deviations from STATVAR. Store values in memory A to E with STO▸ and bring them back with RCL or MEMVAR.
Type instead of tapping
On a laptop, the keyboard presses the same calculator keys, so the projector panel still shows students the keys they would press. Keyboard and tips in the top bar lists every shortcut.
- 0–9+-*/
- Numbers and operations
- Enter
- =
- Esc
- CLEAR
- `
- 2nd
- f
- A b/c
- sct
- SIN, COS, TAN
Teacher controls
Full screen hides the browser around the calculator. Reset the calculator does the same as 2nd RESET and clears memory, Ans, statistics data and past entries. Erase everything also removes the display settings this browser saved.
Built for the classroom
- The same key layout, 2nd functions and menus as the TI-30XIIS that many students use at their desks.
- The projector panel turns on by itself on wide screens, so the back row can read the display.
- Every key press is listed, including 2nd functions, so students see the whole sequence and not just the answer.
- Modes, memory, statistics data and past entries are still there after a reload.
- Keyboard and tips lists the few places where it differs from the real calculator.
No accounts, and nothing leaves the computer
The Two-Line Calculator needs no accounts and sends nothing to Flint. Modes, memory, statistics data and past entries are saved only in the browser on that computer. Erase everything in Settings removes them.
Two-Line Calculator questions
What is the Two-Line Calculator?
A free scientific calculator that runs in a web browser and works like the TI-30XIIS. The top line shows what you type and the bottom line shows the answer. On a wide screen, a projector panel shows a large copy of the display and the keys you pressed.
Is it made by Texas Instruments?
No. Flint built it so teachers can show TI-30XIIS key sequences on the board. TI-30XIIS is a trademark of Texas Instruments, and Flint is not affiliated with Texas Instruments.
How is it different from a real TI-30XIIS?
The top line shows a few more characters, so long entries scroll less. RAND uses its own random sequence, so seeded values differ. There is no automatic power-off. It doesn't give a SYNTAX error for very long entries the way the real calculator does. Keyboard and tips lists every difference.
What grades is it for?
It's made for grades 6–12, the classes where students use a two-line scientific calculator.
How do I show the keys I press?
Turn on the projector panel with the screen button in the top bar. It needs a wide screen, like a smartboard, and turns on by itself on one. Each calculation gets its own line of keys.
Can I use my keyboard?
Yes. Number keys, operations, Enter, Esc and arrow keys work, and letters stand in for other keys, such as s for SIN and f for A b/c. Keyboard and tips in the top bar lists them all.
Does it do fractions and statistics?
Yes. A b/c enters fractions and mixed numbers, and 2nd F◂▸D switches between a fraction and a decimal. 2nd STAT picks one-variable or two-variable statistics, DATA enters the data and STATVAR shows the results.
Do students need accounts?
No. There are no accounts or sign-ins for you or your students.
What do I need to run it?
A web browser on a smartboard, projector or laptop. Students can also open it on their own devices.
Tell us what your class thinks
Send an idea or a bug. Every message goes to the Flint team that built the Two-Line Calculator.
