## Summersnow8 one year ago V = π r^2 h Where: r = 61.0 m, h = 125.3 m Find: V = ? -- 1464740.243 *Be sure to follow the rules for adding and multiplying measurements.

1. zepdrix

Ooo the rules.. oh boy.. I'm trying to remember those..

2. zepdrix

When you multiply, you end up with the lower amount of decimals.... I think? Bah I better look it up

3. Summersnow8

@zepdrix Round the result to the same number of significant digits as the measurement with the least number of significant digits but i can't seem to get the right answer

4. Summersnow8

yeah that = 1464740.243

5. zepdrix

Well, let's make sure we're rounding between each step, not just multiplying it all together :O

6. zepdrix

@phi just take over please -_- my brain todays

7. phi

It sounds like you should round 1464740.243 to 1460000.

8. Summersnow8

okay, ill try that

9. zepdrix

Ya try that :) But I think that if we're following the rules each step of the way, we end up with a slightly larger answer. $\Large\rm V= \color{green}{3.14} (\color{orangered}{61.0m})^2(\color{royalblue}{125.3m})$Squaring, then rounding to 3 digits gives us,$\Large\rm V= \color{green}{3.14} (3720m^2)(\color{royalblue}{125.3m})$Multiplying the pi, then rounding again gives,$\Large\rm V= 11700m^2(\color{royalblue}{125.3m})$Then doing our last multiplication step, before rounding should give us,$\Large\rm V= 1466010m^3$So I think we actually want to round UP in this case, ya?

10. zepdrix

1470000 :d