Counting Money Game
http://www.abcya.com/counting_money.htm
Adding Fractions
https://www.khanacademy.org/math/get-ready-for-5th-grade/x01d8909412c13b9d:get-ready-for-adding-and-subtracting-fractions/x01d8909412c13b9d:fractions-with-denominators-of-10-and-100/e/write-fraction-addition-problems-with-common-denominators--denominators-of-10-and-100-
https://www.khanacademy.org/math/get-ready-for-5th-grade/x01d8909412c13b9d:get-ready-for-adding-and-subtracting-fractions/x01d8909412c13b9d:fractions-with-denominators-of-10-and-100/e/adding_fractions_0.5