Rounding
Decimals: How They Work & Where They Are Used
Real Life Decimals at the Gas Station
Games:
https://www.turtlediary.com/game/rounding-decimals-up-to-thousandths.html
http://www.sheppardsoftware.com/mathgames/decimals/scooterQuestDecRound.htm
https://www.quia.com/cb/148453.html
https://www.free-training-tutorial.com/decimal/decimal-sharks.html
http://www.math-play.com/rounding-decimals-game-1/rounding-decimals-game.html