1372
The panzer has spoken (sh.itjust.works)
submitted 2 years ago by to c/memes@lemmy.ml
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[–] 43 points 2 years ago (3 children)

33% of 7 = 7% of 33

Bitch, this only works for certain easy maths.

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  • [–] 55 points 2 years ago (1 child)

    29% of 29 is 29% of 29

    Fuck, this trick sucks.

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  • [–] 2 points 2 years ago* (last edited 2 years ago) (1 child)

    Which equals 29^2 x .01 => ((28 x 30) +1) X .01
    => (840 + 1) x .01 => 8.41

    28 x 30 is an easy mental calculation, as is adding 1, as is moving the decimal place over 2 places. I am teaching this to 4th graders, in two weeks. % to decimal is next week. They can square 2-digit numbers in their heads, already.

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  • [–] 8 points 2 years ago (1 child)

    1% of 33 is .33

    .33 × 7 =

    .3 x 7 = 2.1

    .03 x 7 = .21

    21 + 2.1 = 2.31

    So

    7% of 33 = 2.31

    You could also do

    33% of 7

    10% of 7 is .7

    1% of 7 is .07

    So 11% is .77

    .77 × 3 =

    .7 × 3 = 2.1

    .07 × 3 = .21

    2.1 + .21 = 2.31

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