This is a set of 15 scales which cover ALL 26 CCSS Math Standards. Some scales are for just 1 standard, while others are for 2 or more similar standards. These are 0-4 scales, with 3 being the proficient level of mastering the standard. All 15 of these scales are also listed for sale individually in my store. However, by purchasing the entire set at once, you save 20% which is the equivalent to getting 3 scales for free! :) Please check out my numerous other scales (other grades and subjects) as well.