Practice Questions: Adding, Subtracting, & Multiplying Decimals:
Practice Questions_Operations with Decimals
Extra Practice and Review: https://www.khanacademy.org/math/cc-sixth-grade-math
and: https://www.khanacademy.org/math/cc-seventh-grade-math
Math Games: https://www.mathsisfun.com/games/index.html
Math Puzzles: http://solveme.edc.org/