You are Here: Home >< Maths

# Rearrangement help watch

1. If given the formula to find V1, why are the numbers on the right hand side divided by that on the left (1000) and not the other way around? I really struggle rearranging equations for some reason, I just need a simple way of remembering

C1V1 = C2V2

1000 x V1 = 20 x 200
V1 = 20 x 200/1000
V1 = 4000/1000
V1 = 4µl
2. (Original post by mimajones)
If given the formula to find V1, why are the numbers on the right hand side divided by that on the left (1000) and not the other way around? I really struggle rearranging equations for some reason, I just need a simple way of remembering

C1V1 = C2V2

1000 x V1 = 20 x 200
V1 = 20 x 200/1000
V1 = 4000/1000
V1 = 4µl
Since you've looking for the value of V1, you want to isolate it on one side of the equation. So, get rid of the 1000 on the left, by dividing the whole equation through by 1000,
3. (Original post by ghostwalker)
Since you've looking for the value of V1, you want to isolate it on one side of the equation. So, get rid of the 1000 on the left, by dividing the whole equation through by 1000,
Thank you!
It seems so simple now, I just couldn't get my head around it.

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: January 4, 2017
Today on TSR

### TSR Pub Quiz 2018 - Anime

Start time will be 6 PM tonight

### University open days

Wed, 21 Nov '18
• Buckinghamshire New University
Wed, 21 Nov '18
• Heriot-Watt University
Wed, 21 Nov '18
Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams