Logarithmic Scales

Equal steps, equal ratios

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• On a log scale, equal steps mean equal multiplication.
• Exponential growth appears as a straight line on a log scale.
• The midpoint between 100 and 1000 on a log axis is about 316.

Steps

1. Two views of growth
2. Reading a log axis
3. Find 50 on a log axis
4. Doubling time from a slope
5. Doublings in three decades
6. Comparing slopes