this post was submitted on 09 Nov 2023
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The panzer has spoken (sh.itjust.works)
submitted 9 months ago by CowsLookLikeMaps@sh.itjust.works to c/memes@lemmy.ml
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[–] PunnyName@lemmy.world 43 points 9 months ago (3 children)

33% of 7 = 7% of 33

Bitch, this only works for certain easy maths.

[–] dylanmorgan@slrpnk.net 55 points 9 months ago (1 children)

29% of 29 is 29% of 29

Fuck, this trick sucks.

[–] n0m4n@lemmy.ml 2 points 9 months ago* (last edited 9 months ago) (1 children)

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.

[–] Finite@lemmy.world 5 points 9 months ago* (last edited 9 months ago)

((30 x 30)-30-29) x .01, easy

[–] Girru00@lemmy.world 19 points 9 months ago

33% is the easy one.... 1/3 of 6 is 2, 1/3 of 1 is 0.33... 2.33..

[–] Sludgeyy@lemmy.world 8 points 9 months ago (1 children)

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

[–] PunnyName@lemmy.world 5 points 9 months ago (1 children)

That's pretty damned intensive for a trick that's supposed to make the maths easier.

[–] plague_sapiens@lemmy.world 2 points 9 months ago* (last edited 9 months ago)

Who said math will be ever easy?