Every year, the countries competing in the International Mathematical Olympiad arrive with a booklet of their best, most ...

Prefer Newsweek on Google to see more of our trusted coverage when you search. A troubling math problem that led to a "heated conversation" among one fifth-grader's family has sparked similar debate ...

Concepts: Counting to 100, add/subtract up to 10 using objects and drawings, and up to 5 by recall; seeing adding as putting things together (composing) and subtracting as taking them apart ...