♫.C.
a few online math games that my 4th graders like:
Penguin Jump multiplication http://www.mathplayground.com/ASB_PenguinJumpMultiplicati...
Guide the Gecko/Bridge Builder Fractions http://www.mathplayground.com/FractionGame/FractionGame.html
Also the multiplication table section of freerice.com gives kids (and grownups) a chance to practice their math for the benefit of the World Food Programme - for each correct answer, they donate 10 grains of rice to the UN world Food Programme http://freerice.com/#/multiplication-table/17488
Math bingo can be another fun activity - in my DD's 3rd grade class last year, the kids would write down numbers on a bingo card and I would pull out different multiplication problems (so if I called "2 x 4", any student with an "8" on his/her card could cover that space) until one of the students got bingo.