algorithm

Everyday

1. An algorithm is a list of clear, step-by-step instructions for solving a problem or doing a task. tree →
2. In computing, an algorithm is the set of rules a computer program follows, for example to sort a list or to choose what videos to show you. tree →

In the lessons

In computing lessons, pupils write algorithms for everyday tasks (making a sandwich, brushing teeth), then turn them into code; they learn that steps must be exact and in the right order (sequence), with choices (selection) and repeats (repetition). In maths, column addition and long division are algorithms. In online-safety lessons, apps use algorithms to choose what you see, which can keep you watching for a long time. Phrases: «write an algorithm», «sorting algorithm», «search algorithm», «the algorithm» (on social media).

Examples

• Write an algorithm for making a cup of tea. tree →
• An algorithm must be precise, or the robot gets confused. tree →
• Long division is an algorithm for dividing big numbers. tree →
• The video app's algorithm suggests new videos. tree →
• We debugged our algorithm because the steps were in the wrong order. tree →
• A sorting algorithm puts numbers in order from smallest to largest. tree →

Note

Use «an»: «an algorithm». Spelled with «-rithm» (no y): not «algorythm». Adjective: «algorithmic». Named after the Persian mathematician al-Khwarizmi. An algorithm is the plan; a program is the plan written in a coding language.