Inverse Operation ProblemsBy liuyisha / February 20, 2021 Think Forum › Forums › Math Kangaroo › Math Kangaroo Level 3-4 › Compiled Questions by Knowledge Point › Inverse Operation Problems This forum has 1 topic, 1 reply, and was last updated 3 years, 8 months ago by Think Expert. Viewing topic 1 (of 1 total) Topic Voices Posts Last Post All Years Started by: Think Expert 1 2 3 years, 8 months ago Think Expert Viewing topic 1 (of 1 total) You must be logged in to create new topics. Log In Username: Password: Keep me signed in Log In Log in / Register