Sorting Numbers

 

 

1. Arrange the digits 1-9 in a line so that each pair of adjacent digits differs by either 2 or 3.
2. Arrange the digits 1-9 in a line so that each pair of adjacent digits sums to a prime number.
3. Now arrange the digits 1-9 in a line so that each pair of adjacent digits (when read as a two-digit number) appears in the times tables from 1 × 1 up to 9 × 9.

 

 

 

        Source: Katie Steckles, The New Scientist

Next One?

 

Number Patterns

There are different number patterns on the following number grid. Can you find them all?

Prime Numbers

 

Rich Tasks 72: Prime Number Maze

Complete the following maze only passing through the prime numbers. You can go to the right or left, up or down but not diagonally.

Beautiful Gifs 9: The Sieve of Eratosthenes

Source https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes

Rich Task 21: Number Sets

Rich Tasks 3: Number Crossword Challenge

Prepare a number crossword using prime numbers, square and cubic numbers. Your target is to complete it with the least amount of dark squares.

Downloadable Link