Skills · The Number System · Factors & Multiples
Prime factorization
Printable practice with an answer key the engine computes, at three levels, in as many versions as you need.
Problem types
- two primes, one repeated: 45
- three different primes: 84
- a prime cubed or more: 72
- three digits, three primes or more: 252
- a prime: nothing to factor: 97
Sample Sheet · Level 1
- 279 =
- 45 =
- 242 =
- 117 =
- 98 =
- 116 =
- 196 =
- 261 =
Answer key
- 3² × 31
- 3² × 5
- 2 × 11²
- 3² × 13
- 2 × 7²
- 2² × 29
- 2² × 7²
- 3² × 29
Sample Sheet · Level 3
- 139 =
- 240 =
- 270 =
- 396 =
- 336 =
- 180 =
- 195 =
- 308 =
Answer key
- 139 is prime
- 2⁴ × 3 × 5
- 2 × 3³ × 5
- 2² × 3² × 11
- 2⁴ × 3 × 7
- 2² × 3² × 5
- 3 × 5 × 13
- 2² × 7 × 11
Make your own
Pick the count, the level and the version, and print it with work space and the key on its own page. The same skill also makes an I Do, We Do, You Do lesson, a Mosaic, a Decoder and more.