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In the discussion thread: I tried to do a simple math problem [View all]

Response to lillypaddle (Original post)

Fri Jan 1, 2021, 06:25 PM

3. Simple math processes ("tricks"?) I learned as a kid help me.

In my head, I think,

8 x 113 =
8 x (100 + 10 + 3) =
800 + 80 + 24 =
880 + 24 =
904

or alternately, handling the 10's place first,

8 x 113 =
8 x (11 * 10) + 8 * 3 =
88 * 10 + 24 =
88 * 10 + 2 * 10 + 4 =
90 * 10 + 4 =
904

Something like 8 * 98 is easy, since it's 8 * (100 - 2) = 800 - 16 = 784.

But then, I think I was born odd.


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lillypaddle Jan 2021 OP
dem4decades Jan 2021 #1
lillypaddle Jan 2021 #2
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royable Jan 2021 #3
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