This set consists of 20 pages (10 pages with 10 problems on each page, 4 different types of pages with rosters for the teacher to record grades, 1 checklist for students or teacher to mark the problems that were correct and the ones missed, and 5 pages of answer sheets). Some of the problems address CCS 4.NBT.2 (Least to Greatest), 4.NBT.3 (Rounding), 4.NF.3 (Adding and Subtracting Fractions), 4.NF.5; 4.NF.6 (Relating Decimals to Fractions). These problems can be used as a teaching tool in large group, working together in small groups, as individual practice, or as an assessment. The problems can hopefully be completed in about ten minutes, but more time may be needed. Getting all ten of the problems out of the ten is the goal. Hopefully with the repetition of practicing these skills, the students will become more confident and accurate. This is set C of Math Skills. Sets A & B are also available. Hope this is helpful!