Infants and animals are able to understand approximate quantities of different types, in terms of relative proportions of the numbers of different sets of objects, provided the difference in numbers ...

Skip counting is a useful skill if you need to count sets of objects, such as pairs of shoes, gloves, the wheels on a tricycle, or even money. Counting on in twos, threes, fives and tens is easy, if ...

Counting is hard. Yeah, it was easy enough when we were in kindergarten, but fast forward a little and suddenly you’re an adult who can’t manage to count past 10 when there’s a weight in your hand.

Numbers can be used most flexibly to quantify, rank and identify. 'Cardinal' number refers to quantitative number assignments assessing set size (numerosity), whereas 'ordinal' number applies to ...

You often have to make quick judgments about the number of objects you encounter in the world. You might see a group of people walking toward you. It is useful to know whether there are roughly five, ...