PPT
Sophia Learning

Sophia: Adding and Subtracting Using Significant Figures: Lesson 2

For Students 9th - 10th
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."
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Math Is Fun

Math Is Fun: Definition of Abacus

For Students 3rd - 8th
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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