Math Is Fun
Math Is Fun: Definition of Abacus
You can use an abacus to count, add, subtract, multiply and more. Try this interactive abacus and see if you can make the numbers. Choose "here's more" for some clues. Good luck!
Sophia Learning
Sophia: Adding and Subtracting Using Significant Figures: Lesson 2
This lesson will demonstrate how to add/subtract measurements and report the result to the correct number of significant digits. It is 2 of 3 in the series titled "Adding and Subtracting Using Significant Figures."
Curated OER
Unesco: Iran: Armenian Monastic Ensembles of Iran
The Armenian Monastic Ensembles of Iran, in the north-west of the country, consists of three monastic ensembles of the Armenian Christian faith: St Thaddeus and St Stepanos and the Chapel of Dzordzor. These edifices - the oldest of...
Curated OER
Mountain Top
Gathered from classes taught at George Mason University, this group of resources offers information on the Natural Setting, Places, People, and Development of Virginia. The author uses a nice conversational tone (as in "Using Cereal...
Curated OER
Science Kids: Science Images: Basic Calculator
This photo shows a basic calculator sitting on a desk. The value of Pi is written to five decimal places on the screen.
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