Try out this math facts card game. If you are still grappling with the algorithms for adding and subtracting rational numbers, try these links (sign in using your school google account):
Classic Riddle: What is the maximum value of change that you can have in U.S. coins (pennies, nickels, dimes, and quarters) without being able to give someone exact change for a one-dollar bill?
How many triangles are in a fully connected pentagon?