These 32 Common Core Main Idea Task Cards by The Teacher Next Door will help your students practice one of Common Core's key reading strategies: finding the main idea using informational text. Each main idea task card has a short informational text passage and asks students to identify the main idea. The passages included are original pieces and were carefully crafted to be high interest and fun! Topics include how potato chips were invented, the Mt. St. Helens Volcano, narwhals and more!