TEACHERS (of all grades)-INSTEAD OF BEMOANING A LACK OF FACTORIZATION SKILLS, LET'S WORK WITH THE PROBLEM IN BITE-SIZE CHUNKS (that is, manageable chunks time-wise--daily, weekly, whenever you have an extra 5 or 10 minutes) OFTEN THROUGHOUT THE SCHOOL YEAR (with each day being somewhat different from every other day) IN ORDER TO REINFORCE THE CRITICAL IMPORTANCE OF THIS KNOWLEDGE.
For grade 4, 5, 6, 7, 8, 9, 10, 11 and 12 TEACHERS, this is the ideal tool to reinforce factorization skills of composite numbers up to 70. WHY?
Each of the 50 pages has a UNIQUE COMBINATION of 20 problems (out of the pool of 49) so that each page differs (somewhat) from the other 49 pages. This means that if you work on a new page each time, you will NEVER have a page that is identical to any other.
Turn to ANY PAGE--do a DAILY WARM-UP the LEFT SIDE of the page (10 problems) or the RIGHT SIDE (10 different problems) or have a CONTEST on the WHOLE PAGE or a QUIZ on a page or portion of a page. PROJECT any page onto your whiteboard or PRINT it out--your choice.
Do your students the ULTIMATE FAVOR--inculcate the desire to know these facts since every math teacher from Middle School onward decries the lack of skills in this area--OF ADDRESSING THIS SKILL in a UNIQUE FASHION.
The dreaded DRILLS can now be done in a comprehensive, different-every-day, approach that can encourage COMPETITION (individual OR group), MASTERY and ENJOYMENT. Best of all, this is far cheaper and versatile than flashcards as you have as many approaches as your imagination will allow.
[The problems in All WORKSHEETS and PREVIEWS are printed in difficulty (1 [easy], 2 [not so easy], 3 [proficiency] up to 4 [mastery]) order within a skill. The actual difficulty level appears slightly to the left of the DK box of each problem in a very small font. Also, instructional references appear on worksheets but are optional on quizzes.]
As these skills are in the OA domain at a 4th grade level, you might want to look at the OA [Operations & Algebraic Thinking] Domain
or the 4th Grade Summary