Mental arithmetic · Hard
Start with a number and follow a chain of operations in your head.
You see a starting number, then operations one at a time, such as “+ 3” or “− 2”. Keep the running total in mind and enter the result at the end.
How to play
You see a starting number, then operations one at a time, such as “+ 3” or “− 2”. Keep the running total in mind and enter the result at the end.
What it trains
Keeping track of information while it changes: counting, mental arithmetic, following moving objects.