Big Numbers [Fun Numbers for Kids]

1 = One

10 = Ten
100 = One hundred
1000 = One thousand
86400 = The number of seconds in a day
1000000 = One million
31556926 = The number of seconds in a year
1000000000 = One billion
7000000000 = The estimated human population on Earth (2011)
1000000000000 = One trillion
1000000000000000 = One quadrillion
1000000000000000000 = One quintillion
1000000000000000000000 = One sextillion
1000000000000000000000000 = One septillion
1000000000000000000000000000 = One octillion
1000000000000000000000000000000 = One nonillion
1000000000000000000000000000000000 = One decillion
1000000000000000000000000000000000000 = One undecillion
1000000000000000000000000000000000000000 = One duodecillion
1000000000000000000000000000000000000000000 = One tredecillion
1000000000000000000000000000000000000000000000 = One quattuordecillion
1000000000000000000000000000000000000000000000000 = One quindecillion
1000000000000000000000000000000000000000000000000000 = One sexdecillion
1000000000000000000000000000000000000000000000000000000 = One septendecillion
1000000000000000000000000000000000000000000000000000000000 = One octodecillion
1000000000000000000000000000000000000000000000000000000000000 = One novemdecillion
1000000000000000000000000000000000000000000000000000000000000000 = One vigintillion

1000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000 = One googol (the number 1 followed by 100 zeros)

1000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000 = One centillion (the number 1 followed by 303 zeros)

One googolplex = The number 1 followed by a googol zeros (there literally isn't enough room in the universe to write this number).

While not really a number, ‘infinity’ refers to a limitless quantity and is represented by a symbol that looks like the number 8 placed on its side.

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

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!

Fun Brain Teasers for Kids

• I am an odd number. Take away one letter and I become even. What number am I?
  
  Answer: Seven (take away the ‘s’ and it becomes ‘even’).
• Using only addition, how do you add eight 8’s and get the number 1000?
  
  Answer: 888 + 88 + 8 + 8 + 8 = 1000
• Sally is 54 years old and her mother is 80, how many years ago was Sally’s mother three times her age?
  
  Answer: 41 years ago, when Sally was 13 and her mother was 39.
• Which 3 numbers have the same answer whether they’re added or multiplied together?
  
  Answer: 1, 2 and 3.
• There is a basket containing 5 apples, how do you divide the apples among 5 children so that each child has 1 apple while 1 apple remains in the basket?
  
  Answer: 4 children get 1 apple each while the fifth child gets the basket with the remaining apple still in it.
• There is a three digit number. The second digit is four times as big as the third digit, while the first digit is three less than the second digit. What is the number?
  
  Answer: 141
• What word looks the same backwards and upside down?