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Khan Academy: Solve Exponential Equations Using Logarithms: Base 10 and Base E Unknown Type
Khan Academy

Khan Academy: Solve Exponential Equations Using Logarithms: Base 10 and Base E

For Students 9th - 10th Standards
Solve exponential equations that have 10 or e at the base of the exponential term. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Activity
Ojk's Precalculus Study Page: Change of Base Formula Activity
Windstream

Ojk's Precalculus Study Page: Change of Base Formula

For Students 9th - 10th Standards
An introduction to logarithms with bases other than 10 and e, and how to work with them when solving equations. This tutorial includes lots of examples and exercises with solutions.
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Activity
K 5 Math Teaching Resources: Base Ten Bag: Addition [Pdf] Activity
K-5 Math Teaching Resources

K 5 Math Teaching Resources: Base Ten Bag: Addition [Pdf]

For Teachers 3rd - 5th
Experimenting with addition. Materials needed :Base 10 blocks (12 tens and 12 ones), paper bag and a die.
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Activity
K 5 Math Teaching Resources: Base Ten Bag (Subtraction) [Pdf] Activity
K-5 Math Teaching Resources

K 5 Math Teaching Resources: Base Ten Bag (Subtraction) [Pdf]

For Teachers 3rd - 5th
Students are to work with a partner to practice subtraction. Materials needed:Base 10 blocks (9 tens and 9 ones), numeral cards (0-9) and a paper bag.
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Handout
Science Struck: How to Convert Octal to Decimal Handout
Science Struck

Science Struck: How to Convert Octal to Decimal

For Students 9th - 10th
Explains what the four different types of number systems are and what they are used for. Presents the formula used to convert octal numbers into decimals and models how to apply it in two example problems.
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