Reviewed both sets of numbers. Forgot 여든. How could I forget 80 sand worms from Dune?
I practiced saying times 1:01, 2:02, 03, etc. 한 시 일 분이에요. Putting both number systems together in one sentence is hard! Maybe I should make some. flash cards with both numbers dancing together. Still using my fingers. They say total physical response is a memory method. All I know is some words I learned with gestures, and I always do the gestures, reflexively.
trying to associate native Korean numbers with crazy images to remember 10 - 90. http://jreidy17.wordpress.com/2014/06/25/what-was-that-word-i-forget/