I use this Bingo activity as a review of multiplication strategies in my 3rd-grade classroom. There are 30 student cards and a teacher call sheet. This activity reviews groups of, repeated addition, using number lines to multiply and arrays. There are 16 squares per card and 25 different squares in the game. This way each card is unique and not all kids have all possible answers. When a student gets "Bingo" I actually have them go "Mmmmm, Multiplication" as if multiplication tasted good. It is fun.
During a leap year, this video would be great to show your students when the question arises, "Why do we have a leap year?" This video discusses the calendar that was developed by the Romans and the Egyptians. Lunar and Solar calendars are discussed.
This NASA video demonstrates how scientists compare distances between the planets and the sun using the measurement system, Astronomical Units. They do a great job discussing scaling and why we use AU's as the measurement system when talking about our solar system.
In this ABCMouse.com video students will get to see a fun video that includes 3 digit subtraction without the regrouping. They show the grid method and the expanded method.