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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Vladyslav Dalechyn
@dalechyn.eth
my method (ukrainian): 25 * (70-5) = = 25 * (4 * 20 - 10 - 5) = // writing as i think through =100 * 20 - 250 - 25 = = 1750 - 25 = 1725
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Gekh | Phaver
@gekh
to quickly calculate in mind, it's easier to round up numbers 25*65 = 1625 25*70 - 25*5 30*70 - 5*70 - 25*5 2100 - 350 - 125 1750 - 125 1625 OR 25*65 = 1625 25*70 - 125 25*80 - 250 - 125 1000*2 - 250 - 125 2000 - 250 - 125 1750 - 125 1625
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