Fractals are very cool!
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Zero ( 0 ) is the only number which can not be represented by Roman numerals. What comes after a million, billion and trillion? A quadrillion, quintillion, sextillion, septillion, octillion, nonillion, decillion and undecillion Plus (+) and Minus (-) sign symbols were used as early as 1489 A.D
Maybe any app that is a math game is cool, since practicing math is great. Super spiro, Rocket Math, Snail Bob, My Math and Math Bubble Popper are all cool apps which test simple math and even some geometry.
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its really easy! but if it doesen't work, click this link:Cool Math Games - Free Online Math Games, Cool Puzzles, Mazes ...I hope this helps:)
our mum
yes it does