Lessons, Videos, Tutorials, Other
Google.com
Place Value, Rounding, Comparing
Fun Brain Value (choose medium level)
Addition & Subtraction
Multiplication
2-by-2 Multiplication w/Regrouping
Division
Fractions
Matching Math Equivalent Fractions
Targeting Equivalent Fractions
Helping with Math: Equivalent Fractions
Math Playground Comparing Fractions
Animal Rescue Fraction Number Lines
Soccer Shootout: Adding Fractions
Fruit Shoot: Subtracting Fractions
Math Man: Add and Subtract Fractions
Multiplying Whole Numbers and Fractions
Decimals
Subtracting Decimals: Soccer Game
Geometry
City Street: Identify Lines & Angles
Measurement
You can find great information from the article below.
Scroll down and look at page 23 and 24, for 4th grade examples on multiplication strategies based on place value. (AREA MODEL and PARTIAL PRODUCTS)