Practice

Ten themes, one skill

The daily question gives you one shot. Practice gives you volume. Questions are grouped into ten themes, from space and the human body to money, transport and history, so you can work on the areas where your sense of scale is weakest.

Every answer comes with its source and a fun fact, and the magnitude ruler shows how far off you were. Questions are shuffled per theme, so you will not see a repeat until you have played the whole set.

How to use it

• Play a theme you know badly. The biggest gains come from the anchors you are missing.
• After each answer, note one number worth remembering. Anchors compound.
• Use the slider when you only know the order of magnitude, and the keyboard when you want a precise figure.