People add even more when they experience information overload, those experiments showed. On an intuitive level, people recognize that subtraction comes less naturally than addition, the authors say.

Subtraction is taking away one number from another. When you subtract it gives you the difference between two numbers. Here are 7 blocks. If you take away three blocks, how many are left? There ...

Column subtraction is a way of subtracting larger numbers. It is called column subtraction, because you write one number underneath the other, using place value to sort the tens and ones in ...