Finding the Start Time | Elapsed Time on a Number Line (Over 1 Hour)

From a channel Lumen includes in full: Every sampled lesson transcript is a direct, worked math explanation or practice set aimed at learners: decimals, fractions, place value, prime factorization and pre-algebra. There are no hooks, hype or clickbait titles. The Lure of the Labyrinth videos use a research-backed MIT learning game explicitly as a vehicle to teach equations, with explanation of the math. The only non-instructional upload type seen is classroom timer videos (EC8sIZ_4BaY), which a title pattern catches.

A 5-minute video from Math with Mr. J's catalogue; the title names its topic.

Video by Math with Mr. J, played through YouTube's embedded player.