Fun Numbers for Kids

• 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!

• Like our fun numbers? Then check out some big numbers!

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