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03OPERATORS · MATH

Python is a super calculator.

An operator is a sign that does a job with two values. Python has seven math signs. Three are new: //, %, and **.

IN REAL LIFE

You do math every day.

Sharing, making groups, and counting tiles are math with operators.

Share a pizza

8 slices for 4 friends: 8 / 4 is 2 slices each.

Candies left over

7 candies for 2 kids: 3 each, and 1 is left over.

Square tiles

A floor 3 tiles long and 3 wide has 3 × 3 = 9 tiles.

THE MATH SIGNS

Seven math signs.

Sign	It does	Example	Answer
`+`	Adds	`7 + 2`	9
`-`	Takes away	`7 - 2`	5
`*`	Multiplies	`7 * 2`	14
`/`	Divides, with decimals	`7 / 2`	3.5
`//`	Divides, whole part only	`7 // 2`	3
`%`	Gives what is left over	`7 % 2`	1
`**`	Power: times itself	`7 ** 2`	49

Remember: You met + - * / in Changing boxes. The new ones are // for the whole part, % for the leftover, and ** for power.

STEP BY STEP

Share the candies.

Python can tell how many each kid gets and how many are left.

candies = 77 candies.

kids = 22 kids.

each = candies // kids7 // 2 is 3. Each kid gets 3.

left = candies % kids7 % 2 is 1. One candy is left over.

print(each, left)Shows 3 1.

RUN IT

Share PyBot's candies.

Guess first. Then run real Python and check.

Guess the result

candies = 7
kids = 2
print(candies // kids)
print(candies % kids)

What will Python show?

share.pyREAL PYTHON

OUTPUT

Ready. Press Run Python.

Python runs here thanks to Pyodide ♥

Pyodide 314.0.3 runs CPython in your browser with WebAssembly.

Open-source under the Mozilla Public License 2.0. License

Now change one thing: Change 7 to 10 candies. Then try kids = 3.

YOUR TURN

Use the math signs.

Try each tiny question. A wrong answer becomes something to review.

0Completed

10Not tried

0Review

Make teams

6 kids want to make teams of 4.

How many full teams, and how many kids are left?

One slash

print(9 / 2)

What will Python show?

Two slashes

print(9 // 2)

What will Python show?

What is left?

print(10 % 3)

What will Python show?

Even or odd?

print(8 % 2)

What will Python show?

Times itself

print(3 ** 2)

What will Python show?

Three times

print(2 ** 3)

What will Python show?

Pick the sign

PyBot has 20 stickers and puts 6 on each page.

Which line gives the stickers left over?

Fix PyBot's code

PyBot shares 12 cookies with 3 friends. It wants a whole number, but it shows 4.0. Change one sign so it shows 4.

PyBot's code

Goal output

OUTPUT

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BIG IDEA

Each math sign does one job.

// gives the whole part, % the leftover, and ** the power. Next: signs that compare.