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I do it all the time when I have to do it in my head. Seems easier sometimes to multiply 6x60 and add on the twelve to get 372.
If I was asked what 15x17 was, it's easier knowing that 15 squared is 225, I then add 30 to it to get my answer.
Maybe that's the approach they have in mind, only using your mind.
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83 944
91 FJ80
84 Ram Charger (now gone)
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