Great for use in intensive math classes as a warm up. One page front and back lasts for 2 weeks. 3 different versions so students do not get bored. Or modify the file to fit the needs of your classroom! Practice factoring, patterns in numbers, writing numbers in words, and basic operations with numbers. Choose easy numbers like 9, 24, or 35 to practice mental math. Or choose more difficult numbers like 323 (17x19) to help students understand larger prime numbers as factors.