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Prime and Composite Numbers to 100

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Prime and Composite Numbers to 100: page 1 of a printable Grade 6 Math worksheet
Grade 6 Math · Factors and Multiples

Prime and Composite Numbers to 100

Prime and composite numbers worksheet for Grade 6: ring the primes on a hundred chart, call four numbers prime or composite, count the factors of a composite number, say why 1 is neither, and list the primes between two numbers. With an answer key.

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Prime and Composite NumbersA teaching handout to hand out before this sheet: the rule, worked examples and common mistakes.
Pages
1
Last updated
Time
About 15 minutes
Answer key
Included
Printing
Black and white
Related curriculum

List every factor pair of a number up to 100, tell whether a number is a multiple of another, sort numbers into primes and composites, and find the greatest common factor and the least common multiple.

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Reviewed by Mr. Daniel Carter, Teacher. How we check worksheets

How to use this sheet

  • Have the child find factors in pairs, starting at 1, and stop when the pairs start to repeat.
  • Keep a multiplication chart on hand for the first sheets, then take it away.
  • For multiples, have the child skip count aloud and write the first few in a row.

Common mistakes

  • Mixing up factors and multiples. Factors of 12 are 12 or smaller; multiples of 12 are 12 or larger.
  • Missing 1 and the number itself as factors. Always start the pair list with 1 and the number.
  • Calling 1 a prime number. A prime has exactly two factors; 1 has only one.
  • Calling every odd number prime. 9, 15 and 21 are odd but composite.

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