Interactive, Game, Graphic Organizer/Worksheet


This activity is 'The Sieve of Eratosthenes' method for finding the prime numbers below 100. The user has to following the instructions provided on top. i.e. First click on 1, then click on the multiples of 2. Once all the multiples of 2 are completed, they disappear. Similarly click on the multiples of 3, 5 and 7 one after the other. Once all the multiples of 7 is finished, the numbers left over are prime numbers below 100.


  • Educational Technology > General
  • Educational Technology > Integrating Technology into the Classroom
  • Educational Technology > Using Multimedia & the Internet
  • Mathematics > General
  • Mathematics > Arithmetic
  • Mathematics > Number Sense & Operations
  • Education > General

Education Levels:

  • Grade 3
  • Grade 4
  • Grade 5


Multiples factors exercises 3 -5 grade age 8 to 10 LCM HCF



Access Privileges:

Public - Available to anyone

License Deed:

Creative Commons Attribution 3.0
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Curriki Rating
On a scale of 0 to 3
On a scale of 0 to 3

This resource was reviewed using the Curriki Review rubric and received an overall Curriki Review System rating of 2, as of 2012-11-29.

Component Ratings:

Technical Completeness: 2
Content Accuracy: 3
Appropriate Pedagogy: 2

Reviewer Comments:

This is an activity involving 'The Sieve of Eratosthenes' in which students identify the prime factors less than 100. The activity is easy to understand and complete. The instructions given are easy to follow.
HyunJin Cha
April 23, 2013
It's quite interesting :)

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