Curated OER
Guess Again!
In this number sense activity, students solve 8 story problems in which clues are given for the ages of a group of people. Students figure out the age of each person in the story.
Other
Problems in the Points Contest of Ko Mal
Learn about the annual KoMal competition in mathematics, physics, and information technology, and challenge your ability to solve problems involving advanced algebra, logic, and other related topics through the tests provided at this site.
Braingle
Braingle: Probability Brain Teasers
Check out the variety of probability brain teasers at this site, which you can sort by popularity and difficulty.
Braingle
Braingle: Math Brain Teasers
Check out the variety of math brain teasers at this site, which you can sort by popularity and difficulty.