Check out these crazy numbers in action turning seemingly normal equations into weird math wonders that boggle the mind. Read on to find some cool numbers and equations that are sure to surprise and enjoy all our fun math facts and trivia.

• 111111111 x 111111111 = 12345678987654321
• 12 + 3 – 4 + 5 + 67 + 8 + 9 = 100
• 1 x 8 + 1 = 9
  12 x 8 + 2 = 98
  123 x 8 + 3 = 987
  1234 x 8 + 4 = 9876
  12345 x 8 + 5 = 98765
  123456 x 8 + 6 = 987654
  1234567 x 8 + 7 = 9876543
  12345678 x 8 + 8 = 98765432
  123456789 x 8 + 9 = 987654321
• The number 142857 is rather special. When you multiply it the digits found in the answer stay the same, just in a different order. Check it out:

  1 x 142857 = 142857
  2 x 142857 = 285714
  3 x 142857 = 428571
  4 x 142857 = 571428
  5 x 142857 = 714285
  6 x 142857 = 857142

  What happens when you multiply it by 7? You get another rather special number:

  7 x 142857 = 999999

  And it doesn’t stop there:

  142 + 857 = 999
  14 + 28 + 57 = 99

  142857 x 142857 = 20408122449
  20408 + 122449 = 142857

  That’s one amazing number!