
@pwharris I did the x11 "trick" in my head to get 847, then doubled it. But did that by first adding 3, to get 850 then 840 to get 1690 then added the last 4. I feel like I'm so bad at mental math so this made me happy I could do it!
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Robin Nehila
2.7K posts

@Radical_Robin
#Iteachmath proud momma of an artist and an actor, natural bodybuilding enthusiast. #MTBoS LGBTQ supporter! @KhanAcademy Ambassador























