Worksheet

F1.9 Arithmetic operators

Programming basics · GCSE · OCR J277 2.2.1, AQA 8525 3.2.3, Edexcel 1CP2 6.5.1 · about 15 min

What this lesson is about

The seven operators, integer division and remainder, and the order they work in.

• The seven operators
• Integer division and remainder
• Division always gives a real number
• Order of operations
• Arithmetic with the robot

Questions 11 marks in all

1. [1 mark]What does this program print?

   print(20 / 5)

2. [1 mark]What does this program print?

   print(10 // 4)
   print(10 % 4)

3. [1 mark]What is the value of 2 + 3 * 4?

4. [1 mark]What is the value of (2 + 3) * 4?

5. [1 mark]Which of these is a float?

   1. A4.0
   2. B4
   3. C-3
   4. D100

6. [1 mark]x % 2 is 0 when x is even. What is it when x is odd?

   1. A1
   2. B0
   3. C2
   4. Dx

7. [1 mark]What does this program print?

   print(round(10 / 3, 2))

8. [1 mark]What is the value of 17 // 5?

9. [1 mark]What is the value of 17 % 5?

10. [1 mark]What does this program print?

    print(2 * 3 ** 2)

11. [1 mark]What does this program print?

    seconds = 135
    print(seconds // 60, seconds % 60)

The task: robot maths

Using only the numbers 17 and 5 in your calculations, print four lines: divide: 3.4, DIV: 3, MOD: 2 and power: 25 (the power is 5 to the power 2). Work each one out with an operator; do not type the answers. The robot must not drive.

# the two lines every program starts with: the commands, then the robot
from bugbot import *
connect()

print("divide:", 17 / 5)

Plan your program here, then type it in and press Run.

Do it on the robot
www.bugbotlab.com/learn/f1-9-arithmetic-operators/
The simulator checks it and tells you when it passes. Nothing to install, no account.

Challenges

1. Print the distance ahead in metres instead of centimetres.
2. Ask for a number of seconds with input and print it as minutes and seconds.
3. Try -7 // 2 and -7 % 2. The answers surprise most people. Work out the rule Python is using.