CK-12 Foundation
Ck 12: Elem Math: Number Riddles Numbers Up to 100000
[Free Registration/Login may be required to access all resource tools.] Students practice with whole number place value by solving riddles.
PBS
Pbs Learning Media: Logical Leaps: Fractions, Mixed Numbers, and Decimals on the Number Line
In this interactive, students use logic to solve three riddles involving a frog jumping contest and then place the contestants' jumps at the correct points on the number line. Numbers are randomized so that the frogs' placements on the...