Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/humanities/grammar/parts-of-speech-the-noun/types-of-nouns/v/concrete-and-abstract-nouns The difference between concrete and abstract nouns can be a little fuzzy. Let's start by focusing on the word origins of "concrete" and "abstract", and see if that gives us a way in. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-nouns/e/abstract-and-concrete-nouns?utm_source=YT&utm_medium=Desc&utm_campaign=grammar Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/v/introduction-to-verbs-the-parts-of-speech-grammar?utm_source=YT&utm_medium=Desc&utm_campaign=grammar Missed the previous lesson? https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-nouns/v/bonus-video-origin-of-the-mutant-plural-the-parts-of-speech-grammar?utm_source=YT&utm_medium=Desc&utm_campaign=grammar Grammar on Khan Academy: Grammar is the collection of rules and conventions that make languages go. This section is about Standard American English, but there's something here for everyone. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s Grammar channel: https://www.youtube.com/channel/UC8JT97hQjMVWeO0B-x8eVxQ?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy ... https://www.youtube.com/watch?v=3AF_rN-yN-Y Note: All Khan Academy content is available for free at (www.khanacademy.org)

These example exercises require us to interpret a number line in order to locate where our positive and negative decimals should be placed. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/decimals-on-number-line-pre-alg/e/decimals_on_the_number_line_3?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Watch the next lesson: https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/comparing-decimals-pre-alg/v/comparing-decimals-1-example?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Missed the previous lesson? https://www.khanacademy.org/math/pre-algebra/decimals-pre-alg/decimals-on-number-line-pre-alg/v/points-on-a-number-line?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra Pre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway. You're the airplane and algebra is your sunny vacation destination. Without the runway you're not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We're about to take off! ... https://www.youtube.com/watch?v=w23DzA68KPE Note: All Khan Academy content is available for free at (www.khanacademy.org)