SOLUTION: I am working on unit conversions for a nrsing test and used previous questions from your website. I was unaware that 1ft= 30.48 cm., so it took me a bit longer to solve the problem

Question 155890: I am working on unit conversions for a nrsing test and used previous questions from your website. I was unaware that 1ft= 30.48 cm., so it took me a bit longer to solve the problem. 18.4 ft= 12in.= 2.54cm.= 1m. = 560.832m.
1 1ft. 1in. 100cm. 100
answer-5.61
I'm never sure which place value to round to. I'm uncertain
about setting up problems in terms of which unit goes on top/bottom. And with this particular problem, I knew that 12 inches=1 ft, but I initally tried using the the conversion 36 inches=3ft, which didn't work. How do you know which conversion factor to use? Thanks for your help! MW
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
I am working on unit conversions for a nrsing test and used previous questions from your website. I was unaware that 1ft= 30.48 cm., so it took me a bit longer to solve the problem. 18.4 ft= 12in.= 2.54cm.= 1m. = 560.832m.
1 1ft. 1in. 100cm. 100
answer-5.61
I'm never sure which place value to round to. I'm uncertain
about setting up problems in terms of which unit goes on top/bottom. And with this particular problem, I knew that 12 inches=1 ft, but I initally tried using the the conversion 36 inches=3ft, which didn't work. How do you know which conversion factor to use? Thanks for your help! MW
------------------------------
The best way to keep track of units is to include them in the calcuations. For example, 3.2 ft = 3.2 ft * 30.48 cm/ft. You can see that there is a foot in the NUM and the DEN, so it cancels, and you get 97.536 cm.
To find the number of seconds in a year, it's
1 yr * 365 days/yr * 24 hr/day * 60 min/hr * 60 sec/min
= 365*24*60*60 (day*hr*min*sec)/(yr*day*hr*min)
= 31,536,000 sec/yr - All units except sec and year cancel, and you can see that they're in the right place.
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