K.MD.A.2
Directly compare two objects with a measurable attribute in common, to see which object has "more of"/"less of" the attribute, and describe the difference. For example, directly compare the heights of two children and describe one child as taller/shorter.
Compare taller and shorter. Compare longer and shorter. Compare heavier and lighter. Compare hotter and colder. In later years we’ll use tools to measure such things.