Standards harmoniously blending?

The following statements are the standards expressed by the NCTM, common core, and CMP websites on the topic of 6th-8th grade math respectively:

In grades 6-8, all students will work flexibly with fractions, decimals, and percents to solve problems.

Compare numbers in a variety of ways, including differences, rates, ratios, and percents and choose when each comparison is appropriate (6, 7, 8)


Apply and extend previous understandings of addition and subtraction to add and subtract rational numbers; represent addition and subtraction on a horizontal or vertical number line diagram. 

The question at hand is "How, if, or when do these sets of standards harmoniously blend together?". All three of these sets seem to have the focus on the topic be in different places, whether it be working flexibly with these numbers, choosing when to use the numbers appropriately, and then how to apply or recognize them on one of the number lines or diagrams. The point of all three of the standards is for these students to understand how to correctly use and apply fractions, decimals, percents and ratios. I honestly think that they each compliment each other very well, and together make a very comprehensive goal for 6th-8th grade students to reach.