Shodor Education Foundation
Shodor Interactivate: Comparison Estimator
Use this applet to practice your estimating skills comparing length, area, counting or a random sampling of those topics. You can also adjust the difficulty and the precision needed. The applet also lets you know how close you are to the...
Grammarly
Grammarly Blog: Double Comparatives and Superlatives
This page focuses on forming comparatives and superlatives and the misuse of double comparisons and superlatives such as "most fastest."
Curated OER
Grammar Rock
A comprehensive look at how an adjective is defined, how it compares to adverbs, degrees of comparison and a vivid view of other usages. Interactive quizzes are available.