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Surf for More Math

Lesson 1- Identifying Factors, Primes, and Composites


To encourage your child to have fun on the Web while learning about Identifying Factors, Primes, and Composites, here are some games and interactive activities they can do on their own or in pairs.



Identify the factors of prime and composite numbers.


Builds Upon

Student Book pages 166-168

Instructions for Use


Factor Tree prompts your child to identify factors.

To use Factor Tree, type in a factor and press 'Enter'. Have your child continue to input factors in the text boxes as they build the factor tree. To create two factor trees, click the radio button 'Two' at the bottom of the screen. Click in any of the four boxes, working with either the blue or the yellow number. When your child types in a divisor of the given number, press 'Enter'. When numbers that are not divisors of the given number are entered, nothing happens. Your child has to correctly identify a factor. Then the other divisor of the number is displayed. When your child enters a non-prime divisor of the number, two new divisor boxes appear to enter further divisors of the given number. When your child enters a prime divisor, the prime shows in a circle the end of that branch. Continue until your child reach primes on every branch of both the yellow and blue trees.


Factors and Multiples prompts your child to take a number apart, and express a number as the product of its factors.

To use Factors and Multiples, input the missing number for each prime factorization in the text box. Click the 'Check Your Answer" button. Click the 'New Problem" button for the next question. A running total of your score is shown.


Primes and Composites lets your child identify prime and composite numbers.

To use Primes and Composites, have your child read the web site.


Practice Primes and Composites prompts your child to distinguish between prime and composite numbers.

To use Primes and Composites have your child answer the interactive questions.