Factors, Multiples & Prime Numbers Worksheet Generator (Factor Trees & Divisibility)
Print free factors, multiples and primes practice for ages 9–12. List every factor on a factor rainbow or a factor-pair T-chart, decide prime or composite, fill in factor trees and write the prime factorization, check the divisibility rules for 2, 3, 4, 5, 6, 9 and 10, list the first multiples, or cross out the sieve of Eratosthenes. Numbers to 50, 100 or 200, with an answer key.
Start with factor rainbows or T-charts so every factor has its partner, then prime or composite, then factor trees. Many of the composite numbers are the ones that look prime (51, 57, 87, 91). A factor tree can be drawn more than one way — the prime factorization at the end is always the same.
Factor Rainbows
- 191
- 221
- 348
- 436
- 557
- 690
Answer KeyFactor Rainbows
- 191171391
- 22113721
- 34812346812162448
- 436123469121836
- 557131957
- 690123569101518304590