You have reached your maximum number of saved items. Remove items from your saved list to add more. Ten clues. Twenty-five squares. How quickly can you solve this bite-sized puzzle? Track your win ...

Did you follow the news this week? Take our quiz to see how well you stack up with other Times readers. Spain became the men’s World Cup champion by triumphing over Argentina with a 1-0 win on Sunday.

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

Today’s post will consider changes in math instruction over the past 10 years and what its future might look like... Alison J. Mello is an author and consultant who has been an educator for 30 years ...