The Everything Kids Math Puzzles Book

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Arithmetic Race for Kids

Make two lines of students divided however you please, this could be young against old, girls against boys or simply those sitting on the right against those sitting on the left.

The two students standing at the front of lines must listen to an arithmetic equation you come up with and quickly answer it before the opposing student can. If they answer correctly then they can sit down at their desk or wait at the side of the classroom, if they guess incorrectly or are beaten to the correct answer by the opposing student then they have to return to the back of their team’s line and wait for another turn.

Continue the game until one of the teams manages to finish their line with everyone having correctly answered a question. To make the activity run smoothly remind students who are not at the front of the line to remain quiet.

If it goes well you might want to play more than one round, giving students a chance to improve and gain some revenge on the opposing team. You can also introduce a points system where the winning team receives a number of points equal to the number of students remaining in the opposing team’s line.

Use arithmetic questions that suit the level of your class, whether it is simple addition and subtraction or tricky multiplication and division.
For example:

Fun Counting Game

Teachers should explain to the class that they will play a simple counting game where the aim is to count from 1 to 40, sounds easy right? Well there are a few twists which make it interesting.

All multiples of 5 should be replaced by a word such as ‘fizz’ (any word you want to use here is fine) and all multiples of 7 should be replaced by the word ‘buzz’ (again, any word you decide to use will be fine). A multiple of both 5 and 7 (i.e. 35) should be replaced by ‘fizz-buzz’ (or a combination of whatever two words you decided to use). Make the students think fast and see if your class can get all the way to 40 without making a mistake.

To make the game a little more difficult you can require that any number featuring a 5 or a 7 (i.e. 17) also require the words ‘fizz’ or ‘buzz’ as a replacement. Trying counting all the way to 100, changing the multiples to something different like 3 and 4 or reversing the order every time ‘fizz’ or ‘buzz’ is said.

The game can also be enjoyed with smaller groups of as little as 3 or 4 students.
Here’s a rundown of how the game should go following the basic rules up to 40:
1, 2, 3, 4, fizz, 6, buzz, 8, 9, fizz, 11, 12, 13, buzz, fizz, 16, 17, 18, 19, fizz, buzz, 22, 23, 24, fizz, 26, 27, buzz, 29, fizz, 31, 32, 33, 34, fizz-buzz, 36, 37, 38, 39, fizz.

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? 
  

Funny Math Riddles for Kids

• Which month has 28 days? All of them of course!
• What’s the easiest way to double your money? Put it in front of a mirror.
• What has a face and two hands but no arms or legs? A clock
• What 4 days of the week start with the letter ‘t’? Tuesday, Thursday, today and tomorrow.
• What goes up and doesn’t come back down? Your age.
• If two’s company and three’s a crowd, what are four and five? 9
• What has a thumb and four fingers but is not alive? A glove.
• What occurs once in every minute, twice in every moment and yet never in a thousand years? The letter m.
• What occurs twice in a week, once in a year but never in a day? The letter e.
• If there are 4 apples and you take away 3, how many do you have? You took 3 apples so obviously you have 3.
• Where do fish keep their money? In the river bank.
• How did the soccer fan know before the game that the score would be 0-0? The score is always 0-0 before the game.

Funny Number Jokes for Kids

• What did the zero say to the 8? Nice belt!

• Why is the number six so scared? Because seven eight nine!

• If you had 4 apples and 5 oranges in one hand and 6 apples and 7 oranges in the other, what would you have? Very large hands.

• Why do golfers carry a spare pair of socks? In case they get a hole in one.

• Why didn't the two 4's feel like dinner? Because they already 8.

• Natural numbers are better for your health.

• What has 6 wheels and flies? A garbage truck.

• 6 out of 5 people have difficulty with fractions.

• 63.7% of statistics are wrong.

• Math is made of 50 percent formulas, 50 percent proofs and 50 percent imagination.

• There are three types of people in the world, those who can count and those who can't.
  

Funny Math Jokes for Kids

• What do mathematicians eat on Halloween? Pumpkin Pi.
  

  

• Why did the math book look so sad? Because it had so many problems.

• A circle is just a round straight line with a hole in the middle.

• Decimals have a point.

• Why do plants hate math? Because it gives them square roots.

• Why did the boy eat his math homework? Because the teacher told him it was a piece of cake.

• Have you heard the latest statistics joke? Probably.

• What did the acorn say when it grew up? Geometry.

• What do you call an empty parrot cage? Polygon.

• Cakes are round but Pi are square.

• How can you make time fly? Throw a clock out the window!

• Without geometry, life is pointless.