Some websites offer a variety of games like guess the number with integers and decimals, arranging decimals, and others that allow students to understand decimals by arranging them numerically to win. Onlinemathlearning.com is one such site that offers all of the above games, including "Builder Ted," which has students numerically arrange decimals to build a roof; "Railroad Repair," which rebuilds a railroad with correct addition of decimals; and "Decimal Darts," which has students type a decimal that is in range in order to aim the dart at the dart board, among many, many other games.
Some sites, like onlinemathlearning.com, include games like addition and subtraction games, comparing numbers and fractions and estimation games that include fractions and decimals. These fraction and decimal related-games include tasks like organizing numbers numerically, and fraction games that teach about comparing fractions to decimals and percentages. Using games that are not solely directed at fractions will allow students to understand how whole numbers and decimals work together.
Sites like Math-Play.com are broken up into different skill level by grade and include sports games like soccer, baseball, football and basketball to engage students. These games including topics like adding and subtracting decimals, rounding decimals to the nearest tenth, decimal place values, multiplying decimals and fractions and percentages. The sports aspect allows students to engage in topics that are fun while simultaneously learning about the importance of decimals.
This online game from quia.com allows students to play decimal-related Jeopardy in solo-games or in pairs. Learn about decimals and how to do addition, subtraction and other manipulation of decimals through this fun and well-known trivia game.