Calculator

It reads M and the stored number, and it sits to the left of the M key. It appears only while the memory holds something other than zero, and it disappears again after you clear the memory.

Each finished sum takes one line, for example 125+37=162. While you type the second number of a sum, the last line also shows the answer Equals would give, so you see it before you press anything. If the sum has no answer yet, such as a divide by a zero you are still typing past, the line simply stays as it was.

The history is kept between launches. You can select any part of it with a long press and copy it. Pinch it with two fingers to make the text bigger or smaller; there are five sizes, and the one you choose is remembered. With the Large keys keypad the history shrinks to a few lines.

You can send the whole history away or save it as a file from the menu.

Undo

Clear history in the menu deletes every saved line. It cannot be undone, so save the history first if you may need it.

Tap it to copy the number to the clipboard; the copy has no digit grouping, so it pastes cleanly anywhere. Touch and hold it to paste a number from the clipboard. If the clipboard holds a whole sum, such as 12*7+5, the calculator works it out and puts the answer in the history.

Long numbers shrink to fit the width. With Group digits on, a comma separates every three digits. A message such as Can't divide by zero. shows here when a sum has no answer; Clear or any digit key takes it away.

The memory keys stay out of the way until you need them. Press M once to show the row and again to hide it. The calculator remembers whether the row was open the next time you come back.

Use it to build a running total across several sums: work out one amount, press M+, then start the next. The result line does not change, and the indicator shows the new total in memory. The memory is saved, so it is still there after you close the calculator.

It is the opposite of M+. Use it when a figure has to come off the running total. The result line does not change; the indicator shows the new total.

The stored number is typed in as if you had entered it yourself, so you can use it as the first or the second number of a sum. The memory itself stays as it was.

Use it when a running total is finished and you want to start another. The memory indicator disappears.

Undo

The stored number is lost, and the calculator has no undo for it. Press MR first if you want to see it one last time.

It clears the number you are typing, the operator you pressed and the unfinished line at the bottom of the history, and it also takes away an error message. The history and the memory are not touched.

Shortcut

Esc

Use it when you mistyped the second number of a sum: the first number and the operator stay, and you can type the second number again. With no operator pressed it simply sets the number back to 0.

Use it for a typo. When the result line holds a finished answer instead of a number you are typing, one press resets it to 0.

Shortcut

Backspace

After plus or minus it takes that percent of the first number: 200 + 10 % gives 20, so Equals then adds 20 to 200. Otherwise it divides the number by 100. Touch and hold the key to save the history to a file, as Save history in the menu does.

Each press adds a digit to the number on the result line. Leading zeros are dropped, so 007 becomes 7. A physical keyboard works too: the digits on the top row or the number pad.

Every digit key has a second job when you touch and hold it, written in small type under the digit: 1 gives 1/x, 2 gives x squared, 3 the cube root, 4 the square root, 5 raises to a power, 6 the factorial, 7 the sine, 8 the cosine and 9 the tangent. Holding 0 types three zeros at once, which is handy for thousands. Each of these does the same as the matching row in the Function window.

Shortcut

0 / 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9

A number can have only one point, so a second press does nothing. After an operator, or on a fresh sum, the point starts the number as 0.. Touch and hold the key to put in the number pi.

Shortcut

.

Press it before or after typing the number. It does nothing to a zero. Touch and hold the key for the cotangent (ctg) of the number, in degrees.

Press it after the first number, then type the second one. In a longer chain the sum is worked out from left to right: pressing the next operator after the second number works out the sum so far and carries the answer on. Touch and hold the key to copy the result. On a keyboard, the plus key does the same as a tap.

Use it between two numbers. To type a negative number, use Change sign instead. Touch and hold the key to paste a number or a sum from the clipboard.

Shortcut

-

Press it between two numbers. Touch and hold the key to send the result to another app through the share sheet.

Shortcut

*

Press it between two numbers. A division by zero has no answer, so the history stays quiet while you type, and the message Can't divide by zero. appears only when you press Equals. The calculator then also shows a joke alert that looks like a system warning about deleted data; it is a prank, and nothing is deleted. Its only button, More details.., opens a web page about April Fools' Day in your browser.

Touch and hold the key to round the number on the result line to a whole number.

Shortcut

/

The finished sum goes into the history. Press Equals again straight away to repeat the last operation: after 5 + 3 = 8 the next press gives 11, then 14. Starting a new number clears that repeat.

Shortcut

Enter / =

The key marked with three lines opens a menu of eight rows. Copy and Paste work with the clipboard, as tapping and holding the result do. Round makes the number on the result line a whole number. Function opens a list of functions. Send result passes the number to another app, and if no app can take it a short message says so. Save history writes the history to a text file in your Downloads folder and tells you its name; with an empty history it says so instead. Clear history empties the history. Calculator settings opens the settings window.

Touch and hold this key to close the calculator. Opening the calculator from the text editor with a selected sum and closing it this way hands the result back to the editor, which puts it into the text.

Undo

Clear history deletes every saved line at once and cannot be undone. It is only in the menu, never under a held key, so a long press cannot wipe it by accident.

When the calculator is switched off in Settings, the keypad gives way to a short message. You can meet it, for example, when you open the calculator from a home-screen widget. The calculator does not work until you switch it on again.

It takes you to the Management tab of Settings; the Calculator switch is under Additional programs and scenarios. Turn it on, come back to this screen, and the keypad is there. No restart is needed.

Pick a function and the window closes. Most work on the number on the result line at once: sin, cos, tg and ctg (in degrees), square root, cube root, square, 1/x, log, ln and n!. Power (xʸ), DIV (whole-number division) and mod (remainder) are operators: press one, then type the second number and press Equals. The pi row puts the number pi on the result line. A function that has no answer for the number, such as the square root of a negative or the factorial of 1.5, shows an error message instead. The same functions sit under a held digit key.

With it on, 1234567 reads as 1,234,567. The grouping applies on both sides of the decimal point and only changes how the number looks. A copied number always has no commas. It is on by default.

Drag the slider to choose the biggest size the result can have. Very long numbers still shrink so that they fit the line. The default is a middle size.

Normal is the standard layout. Large keys makes the keypad take most of the screen and cuts the history to a few lines, which is easier with big fingers. Compact, bottom right gathers smaller keys in the bottom right corner so that one thumb reaches all of them.

Nothing changes: the settings stay as they were before you opened the window.

The calculator uses the new settings at once. The choices are kept for the next time.