Most of us have little trouble working out how many millilitres are in 2.4 litres of water (it’s 2,400). But the same can’t be said when we’re asked how many minutes are in 2.4 hours (it’s 144).

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Lisa Davidson of La Canada Flintridge was surprised to see all the numbers -- instead of letter grades -- and other data on her son’s elementary school report card. Her shock quickly turned to ...

Analysis: humans and animals actually share some remarkable numerical abilities up to a point Counting feels utterly effortless to adults, who are unlikely to even remember when or how they picked up ...

Counting feels utterly effortless to adults, who are unlikely to even remember when or how they picked up this useful, apparently automatic skill. Yet when you think about it, counting is a remarkable ...