Numbers & operators

Two kinds of number

• An integer (int) is a whole number, like 7 or -3.
• A float is a number with a decimal point, like 2.5.
• Division with / always gives a float, even 4 / 2 → 2.0.

Add, subtract, multiply, divide

• + adds, - subtracts, * multiplies, / divides.
• You can use them with variables or with plain numbers.
• Spaces around operators are optional but make code easier to read.

print(7 + 2)
print(7 - 2)
print(7 * 2)
print(7 / 2)

Whole-number division, remainder, powers

• // divides and keeps only the whole part (floor division).
• % gives the remainder (called modulo).
• ** raises to a power: 2 ** 3 is 2×2×2.

print(7 // 2)
print(7 % 2)
print(2 ** 5)

Order of operations

• Python does ** first, then * / // %, then + -.
• This is the same order you use in maths.
• Use parentheses (...) to change the order.

print(2 + 3 * 4)
print((2 + 3) * 4)

Common mistakes

• / always gives a float (4 / 2 is 2.0); use // when you want a whole number.
• Power is **, not ^.
• "3" + "4" joins text into "34" — it does not add to 7.

Now you try

• Store each answer in the variable named in the task.
• Press Check answer to test your code.