Dan Romero
@dwr.eth
How does the German method work? 25 * 65 = 1,625 25 65 5 * 5 = 25 (2 * 6) + 5 = 17 1,725 What am I missing?
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jim
@mcpherson.eth
This only works with numbers both ending in 5, right? Change it to: 35 x 79 --------- 5 * 9 = 45 (3 * 7) + 9 = 30 3045 is ... incorrect. ๐คจ How do you get to the correct answer (2765) using German method?
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jim
@mcpherson.eth
Ah ok, found a video. You have to multiply all digits against each other and add anyway. 5*9=45 3*7=21 (keep 2145 in mind) now multiply the 5*7= 35, add it to the 3*9= 27, and then add those together (62) and add them to the middle two digits: 2145 +_62_ _______ 2765 https://www.youtube.com/watch?v=wP4vOS4SmYA
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