Number Riddles: Factors, Multiples and Primes (Grade 4)
Eight 4th grade number riddles about primes, common factors, multiples of 12 and 25, square numbers and a 4-digit number with equal digits. Key on page 2.
- Size
- US Letter (8.5 × 11 in), fits A4
- 2 pages: the worksheet and its answer key
- Level
- Grade 4
- License
- Free for personal & classroom use
About this worksheet
The vocabulary steps up: "I am a prime number: only 1 and I myself divide me evenly. I am between 20 and 30. My digits add up to 5" and "I am a factor of 36. I am a factor of 24. I am greater than 6." One riddle leads to a four-digit number with all digits the same, and another to a three-digit odd multiple of 25. Each riddle defines prime in the clue itself, so no prior lesson is required. Fourth graders take about fifteen minutes. Listing factors or multiples on scrap paper before reading the next clue is the method that works. Answers go in the box, key on page 2.
Tips for using it
- List the factors or multiples a clue names before you read the next clue.
- Say the definition of a prime number in your own words after riddle 1.
- Find the two riddles that share the word square and compare their answers.
- Write a riddle whose answer is a prime number between 40 and 50.
Printing tips
Download the PDF and print at 100% (or “fit to page” on A4). Page 1 is the worksheet and page 2 is the answer key with the answers in red; print just page 1 if you want to keep the answers for checking. Free for personal, family and classroom use.
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