Class 08 Activity – Lucky Numbers

Find all the Lucky Numbers between 1 and 100 as follows.

Procedure 1.

Write down all the numbers  from 1 to 100.  

2. Circle the first number 

The first row will then be 1 2 3 4 5 6 8 9 10

The first number not circled is 2.

Counting from 1, cross out every 2nd number.

The first four rows will then be 

 The first number not circled or crossed out is 3.

Circle this number.

Counting from 1, cross out every 3rd number not crossed out.

The first four rows will then be 

The first number not circled or crossed out is 7.Circle this number.

Counting from 1, cross out every 7th number not crossed out.

The first four rows will then be

5. Continue like this until all the numbers are either circled or crossed out.

The circled numbers are Lucky Numbers.

Investigate Lucky Numbers.

You could look for patterns.

You could investigate the sums or differences of Lucky Numbers.

You could find all the Lucky Numbers which are smaller than 1000.