- Percents and Fractions
- Proportional Reasoning
On January 26, 1905, a 3,106-carat diamond was discovered in Pretoria, South Africa. Weighing nearly 1.5 pounds, the Cullinan, as it was named, is the largest diamond ever found. Since the greatest...
- Probability, Counting and Combinatorics
- Proportional Reasoning
- Solid Geometry
Did you know that May 20th is the official birthday of “blue jeans”? It was on May 20, 1873 that Levi Strauss and David Jacobs received patent number 139,121 from the US Patent and Trademark Office...
- Probability, Counting and Combinatorics
On the game show Wheel of Fortune®, contestants spin a wheel, like the one shown here, to determine how much money will be won for solving the puzzle. What is the probability that a contestant spins...
- Probability, Counting and Combinatorics
- Problem Solving (Misc.)
- Proportional Reasoning
- Sequences, Series and Patterns
Chantel is going to a new school this year and will be in the 8th grade. She has learned that there are 11 7th graders and 13 8th graders (including herself) in her homeroom. If the desks in her...
- Probability, Counting and Combinatorics
The holidays are here, and it’s not uncommon for offices and classrooms to do a gift exchange. These often work as follows: the names of all participants are put into a hat, and everyone draws a name...
- Number Theory
- Probability, Counting and Combinatorics
- Problem Solving (Misc.)
- Solid Geometry
The weekend has just begun, and Derek wants to build a snowman either on Saturday or Sunday, but he can only build a snowman if it snows. There is a 1/2 probability that it snows on Saturday, and a 1...
- Probability, Counting and Combinatorics
- Problem Solving (Misc.)
Troy, Elliott and Shaun are three contestants on a game show. In one of the rounds of the game show, the 3 contestants have a chance to spin a wheel up to two times in a row to try to get the highest...