[bsugar888]

Hello all,I'm getting ready to start my second semester of nursing school of the 22th of this month. Eash semester we must take a calculations exam....I have always had problems when it came to problems with grains......I'm looking over my practice exam..and dont have a clue how to set up or do this grains problem....can someone show me how to set up grains problems..and how to solve them.
My school uses the formula.....gr i = 60 mg or gr vx = 1000mg.

Here is the problem.
Order NTG gr 1/150 IV stat. Available: NTG 0.4 mg/ml. How many ml's will you give?
Any help would be a blessing....Thanks all.

[agldragon]

Originally Posted by bsugar888

Hello all,I'm getting ready to start my second semester of nursing school of the 22th of this month. Eash semester we must take a calculations exam....I have always had problems when it came to problems with grains......I'm looking over my practice exam..and dont have a clue how to set up or do this grains problem....can someone show me how to set up grains problems..and how to solve them.
My school uses the formula.....gr i = 60 mg or gr vx = 1000mg.

Here is the problem.
Order NTG gr 1/150 IV stat. Available: NTG 0.4 mg/ml. How many ml's will you give?
Any help would be a blessing....Thanks all.

= (1/150) X (60 mg) (cancel the zero)
= (1/15) X (6)
=6/15
=2/5
=0.4 mg ( same as gr 1/150, the original order)

Then (0.4 mg / 0.4 mg) X 1 mL

So, you would give 1 mL

[CT Pixie]

Originally Posted by agldragon

= (1/150) X (60 mg)
= (1/15) X (6)
=6/15
=2/5
=0.4 mg

Then (0.4mg / 0.4 mg) X 1 mL
So, you would give 1 mL

your fingers were quicker than mine

[bsugar888]

I tried 150 x 60 and I got 9000
so what am I doing wrong.
I see what you did But just dont get the hang on it....I feel so dump.

Where is 1/15 x 6 coming from???

[agldragon]

Originally Posted by bsugar888

I tried 150 x 60 and I got 9000
so what am I doing wrong.
I see what you did But just dont get the hang on it....I feel so dump.

Where is 1/15 x 6 coming from???

= 1 ... .. 60
---- X -----
150 ...... 1

= (1 X 60)
-----------
(150 X 1)

= 60 / 150

= 6 / 15 ( i just cancelled the zero to make the number smaller)

[Toey]

wow I had a nice long explanation, then I realized someone replied..

[CT Pixie]

think of it a sixty over 1 times 1 over 150..

60 x 1
1 150

you can reduce the 60 down to 5 (after you divide by 10) and 150 down to 15 (after you divide by 10)

then it reads on 1 over 15 times 6 over 1 giving you 6 over 15. You can either reduce 6/15 to 2/5 or leave it the way it is. Either way, then divide the bottom number into the top and thats your conversion.. 0.4mg=1/150grains

[bsugar888]

can I do this with all grains problems???....is so I think I got it You guys make it sound soooo easy......thank you hats off to all.....

[agldragon]

Originally Posted by bsugar888

can I do this with all grains problems???....is so I think I got it You guys make it sound soooo easy......thank you hats off to all.....

Yes, what ever the grain(s), you multiply it by 60 / 1 (sixty over one).

And try to always reduce your number to a smaller one so that it would be easier to solve (if you are allowed to use a calculator then you don't have to).

Angel

[CT Pixie]

Yup, do the exact same thing for any other grain conversion. Oh, a way our instructor had use memorize/remember grains to mg or vise versa was..draw a clock face..on the inside put the numbers like they'd correspond with the clock..for example put 15 where quarter after would be 30 where 1/2 hr would be 45 where quarter of would be and 60 where the hour would be..now on the outside next to the the 15 put 1/4 (quarter past the hour), at the 30 put 1/2 (half past the hour) at the 45 put 3/4 (three quarters of an hour) and at the 60 put 1 (hour). guess what you now have..yup the grain to milligram or milligram to grain conversions. look at the clock. 15mg is 1/4 grain, 30milligrams is 1/2 grain, 45mg is 3/4 grain and 60mg is 1 grain!

Ever dose calc test I take, I immediately put the clock face down