Memes

45132 readers

3258 users here now

Rules:

Be civil and nice.
Try not to excessively repost, as a rule of thumb, wait at least 2 months to do it if you have to.

founded 5 years ago

MODERATORS

[email protected]

1362

The panzer has spoken (sh.itjust.works)

submitted 10 months ago by [email protected] to c/[email protected]

77 comments fedilink hide all child comments

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 54 points 10 months ago (1 children)

29% of 29 is 29% of 29

Fuck, this trick sucks.

[–] [email protected] 2 points 10 months ago* (last edited 10 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.

[–] [email protected] 5 points 10 months ago* (last edited 10 months ago)

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