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."
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!
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