- Discover Activities for kids
- Facts of the Week
- Activity Sheets
- Storytime Videos
- Write a Story
-
Fact of the Week
Learn a different fact every week!


A champion mathlete can add ten ten-digit numbers in thirteen seconds
Fact of the week
4 September 2023
A champion mathlete can add ten ten-digit numbers in thirteen seconds
Every two years, a Mental Calculation World Cup takes place in Germany. The competitors, sometimes known as mathletes, solve complicated calculations incredibly quickly, all in their heads. Some of the challenges include multiplying two eight-digit numbers, add ten ten-digit numbers, and calculate the correct day of the week of a date.

Find out more in:
100 Things to Know About Numbers, Computers & Coding

- Previous Page
- Next Page
Previous Facts of the Week
-
-
14 July 2025
Did you know what percentage the sun takes up of all the matter in our solar system?
Want to know more? -
-
30 June 2025
These revolutionary and ridiculous inventions are older than you might think....
Want to know more? -
23 June 2025
The largest tractor in the world weighs more than seven double decker buses
Want to know more? -
-
-
More 100 Things To Know books
Find lots more amazing facts in these books!
-
Age: 9+RRP NZ$22.99
-
Age: 8+RRP NZ$22.99
-
Age: 8+RRP NZ$22.99
-
Age: 8+RRP NZ$22.99
-
Age: 8+RRP NZ$22.99
-
Award WinnerAge: 8+RRP NZ$22.99
-
Age: 8+RRP NZ$22.99
-
Age: 8+RRP NZ$22.99
-
Age: 8+RRP NZ$22.99
-
Award WinnerAge: 8+RRP NZ$22.99
-
Award WinnerAge: 8+RRP NZ$22.99
-
Age: 8+RRP NZ$22.99
-
Age: 8+RRP NZ$22.99