Fun math for kids

Quess the number

Cut the paper and have fun with your friends. You can quess the number which they imagine. Here!

Adding more numbers in a series

Ask someone to add all the numbers from 1 to 200 and then surprise them by giving them the result in less than one minute. How?

The sum of the first and last, second and second last numbers and so on are always the same. Meaning, 1+200, 2+199, 3+198 is always 201. In total we have 100 sums like this so 201*100 = 20 100.

Multiplication table with the help of fingers

Do you know that you can multiply numbers bigger than 5 with the help of your fingers. But, that is just to assist you, you should know the multiplication table by heart. Here!

Multiplying numbers from 11 to 20 in an easy way

Two double-digit numbers smaller than 20 can be multiplied in a shorter and quicker way. Here!

How to quickly multiply number 11 with double-digit numbers?

Number 11 and any double-digit number can be multiplied in a shorter and quicker way. Here!

How is this possible?

We have four shapes and we create a triangle. If we assemble the shapes in a different way on the same surface we will have a “hole” ? Here!

Calculate the day

A formula that can help us calculate what day any date was. Here!

Numbers

The numbers of old Romans, Greeks or Egiptians. Here!

Prime Numbers

The first 500 prime numbers. Here!

Multiples

Interesting results of multiplication. Here!

Large numbers

What is the largest number that you know? A million? A milliard? A billion? And after that? Check to see to what number you can count to. Here!

Sum = 100

How can we get a sum of 100 by adding numbers til 9, ordering according to their size. Here!

Magic number

The remainder that we get when we divide the number 2519 with numbers from 1 to 10. Here!

PI Number

Probably the most popular number in human history. The Pi Number is usually written as 3.14, but in reality it has an infinite number of decimal places. The simplest way to describe the Pi Number is that is a number which gives us the ratio of the circle’s circumference and its diameter. There were many attempts throughout history to get the Pi Number to as many decimals as possible – and here is the Pi Number calculated to 115 decimal places:

3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 58209 74944 59230 78164 06286 20899 86280 34825 34211 70679 82148 08651 32823 ...

How old are you exactly?

Calculate how many years, months, weeks, days, hours, minutes old you are. Here