Convert pounds to kilograms, please help

Jolie, BSN · May 16, 2009

Have you tried Googling "English metric conversion formulas"? Are you rounding to the the correct number of significant figures?

crazytonurse · May 16, 2009

Can you show me step by step an easy way of converting these.
9 lbs 6 ounces I put 4.47 Correct answer is 4.26
17lbs 14 ounces I put 8.61 Correct answer is 8.13
62lbs 12 ounces I put 28.93 Correct answer is 28.52
My method is obviously not working. I am always so close. Please help.
Thanks in advance...:crying2:

well I obviously I am doing something wrong as well. I know 1kg = 2.2 lbs. so in my math I am coming up with different as well. I am interested in other answers.

allnurses Guide · May 16, 2009

- 2.2 lbs in a kg.

- 28.35 g in an oz

9lb 6 oz:

- 9/2.2 = 4.09 kg

- 6 x 28.35 = 170g

So total = 4090 + 170 = 4260 g = 4.26kg

17lbs 14 ounces:

- 17/2.2 = 7.72kg

- 14 x 28.35 = 396.9g

Total = 8117g = 8.12kg

62lbs 12oz:

- 62/2.2 = 28.18kg = 28180g

- 12 x 28.35 = 340.2g

Total = 28520.2g = 28.52kg

JenRN30, BSN · May 16, 2009

Another quick way....

for 9 lbs 6 oz

6 oz out of 16 oz in a lb (6/16 = 0.375)

So, add 0.375 of a lb to 9 lbs = 9.375

9.375lbs /2.2 = 4.26 kg

for 17 lbs 14 oz

14/16 = 0.875

17.875/2.2 = 8.13

62 lbs 12 oz

12/16 = 0.75

62.75/2.2 = 28.52

deemarys · May 16, 2009

2 very different ways to get the answer, Wonder if there are other ways since 2 people still got 2 different answers for 8.13

deemarys · May 16, 2009

Another quick way....
for 9 lbs 6 oz
6 oz out of 16 oz in a lb (6/16 = 0.375)
So, add 0.375 of a lb to 9 lbs = 9.375
9.375lbs /2.2 = 4.26 kg
for 17 lbs 14 oz
14/16 = 0.875
17.875/2.2 = 8.13
62 lbs 12 oz
12/16 = 0.75
62.75/2.2 = 28.52

Thanks I will do it this way from now on.

Leesha · May 22, 2009

Hi,

You take the pounds divided by 2.2 and that will give you the kilograms.

Good Luck,

Leesha

tfleuter, BSN, RN · May 23, 2009

2 very different ways to get the answer, Wonder if there are other ways since 2 people still got 2 different answers for 8.13

It's all about sig figs. Where one method starts you out with a "clean" number (14/16 = 0.875) the other starts out with a repeating decimal (17/2.2 = 7.272727272727272727272.....) Depending on where one chooses to round up the number (middle of the equation or at the end) will change the outcome. In either case, both are very close, but would be a concern if you needed to be exact up to the hundredths place.

RossayRN · May 23, 2009

thats weird because i get 17.14/2.2= 7.79=7.8 . I checked it on a converting program and the answer is still the same as mine. I have also passed all my math tests with 100% so I don't know what to say.

kdsrn · May 24, 2009

I am a pediatric nursing instructor. The method used by JennieB30 is the most widely used method. I'm sorry RosssaysoonRN but your answer is incorrect.

RossayRN · May 25, 2009

Well until I get an instructor that tells me that 2.2lbs doesn't equal a Kilogram and all the books used that have taught me to do my math the way that I do then I'll continue to do them this way or unless all of a sudden I start failing my maths test then I am not wrong. There are many different ways to get a right answer.