# L1.30 Understand probability on a scale from 0 (impossible) to 1 (certain) and use probabilities to compare the likelihood of events

Useful PPT for introducing or revising probability. Warm up questions with built in answers followed by several sets of tasks - one based on another Skillsworkshop sheet (Independent Events - see link under "See also"). Covers likelihood line, calculating probability (including simplifying fractions) and probability of events using a number line.

This is a project based on Benford's law. I had this idea after watching the Numberphile series on YouTube. This is a project based activity that involves many skills including working with large numbers, using percentages, representing data and probability.

The investigation is introduced to learners using the PPT (and optional YouTube links). Learners then split into four groups - each is given a random set of share prices [see Excel file]. Each group investigates the occurrence of numbers starting with each digit from 1 to 9.

**Editor's note**