Grades 4–5
Prime or Composite?
Thirty numbers from 2 to 99. Kids circle P for prime or C for composite and write one factor pair for each composite.
Math worksheet · Multiplication fact worksheets
Factor Pairs
Ten numbers up to 60. Kids list every pair of factors, then say whether the number is prime or composite.
- Grade level
- 4th grade
- Time
- About 25 minutes
- Answer key
- Yes, page 2 of the PDF
- Kids practice
- Multiplication facts, Arrays and equal groups, Skip counting, Multi-digit multiplication
What kids do
“Find every pair of numbers that multiply to make the number. Is it prime (one pair) or composite?”
Printed on the sheet:
- Prime or composite?
- Start with 1 × the number, then try 2, 3, 4… Stop when the pairs start to repeat.
Teacher tip
Have kids build each number as rectangles with square tiles. Each rectangle is a factor pair.
How to use it
- Let kids draw quick arrays for any fact they don’t know yet.
- Have kids star the facts they know by heart and practice the rest on flash cards.
- Do the first problem together under a document camera, then let kids finish on their own.
Watch for
Kids who add instead of multiply when they are tired. Ask them to read the sign out loud.
Talk about it
- Why does turning the factors around give the same product?
- Which problem was the hardest? What made it hard?
Take it further
Play multiplication war with a deck of cards: flip two, multiply, highest product wins.
US Letter, prints well in black and white. Free for home and classroom use: print as many copies as you need.
More multiplication fact worksheets
Grades 2–3
Multiplication Arrays
Six dot arrays. Kids count the rows and the dots in each row, then write the multiplication sentence.
Grades 3–4
Multiplication Facts: 0 to 5
Forty facts with the 0, 1, 2, 3, 4 and 5 times tables, mixed up. Great for a timed quiz.
Grades 3–5
Multiplication Facts: 6 to 10
Forty facts with the 6, 7, 8, 9 and 10 times tables, the trickier half of the chart.
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