Welcome Guest Search | Active Topics |

Tag as favorite
Chem Math
Options
Previous Topic Next Topic
Mariam_6809
#1 Posted : Monday, June 21, 2021 12:46:51 AM
Rank: Newbie

Groups: Registered
Joined: 5/27/2021
Posts: 5

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
This might be a bit of a dumb question :,) But my mental math is very weak and I struggle to do quick calculations. On one of the questions, we had to divide 0.55g/204.2, the answer was about 0.0027. But I personally have no idea how to do this in my head. I tried rounding to 0.5 and 200, but I still wasn't sure.
Back to top
Report?
INSTR_Katrina_128
#2 Posted : Tuesday, June 22, 2021 5:19:33 PM
Rank: Advanced Member

Groups: Registered
Joined: 5/18/2021
Posts: 73

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Not a dumb question at all! Mental math is hard. 😥

First, let's approximate these values:

0.55 / 204.2 = 0.5 / 200

Then, let's do a SNEAKY TRICK:

0.5 / 200 = 0.5 / (2 x 100)

mwahahaha...

So, let's divide 0.5 by 2, and THEN divide it by 100.

0.5 / 2 = 0.25

Then, divide by 100 (aka move the decimal place over by 2)

0.25 / 100 = 0.0025

Heeeeey that's not so bad! 😀
Back to top
Report?
Users browsing this topic
Guest (2)
Tag as favorite
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Clean Slate theme by Jaben Cargman (Tiny Gecko)
Powered by YAF | YAF © 2003-2009, Yet Another Forum.NET
This page was generated in 0.071 seconds.