Video instructions and help with filling out and completing Form 2220 Conversion

Instructions and Help about Form 2220 Conversion

Now let's talk about how to convert DMS that is degrees minutes and seconds into a decimal in degrees let's think of an hour as being equal to one degree and there's 60 minutes in one hour and there's 3600 seconds in an hour this will help you to remember what to do when you convert in DMS to a decimal in degrees so let's say if we have the value 45 degrees 28 minutes and 32 seconds let's convert that to degrees so here's what you need to do it's going to be equal to 45 plus 28 divided by 60 always divide the number of minutes by 60 because of 60 minutes an hour plus 32 divided by 3600 there's 36 there's 3,600 seconds in an hour so divide the second spot in 3600 and just type this information in your calculator and it should give you the answer so 45 plus 28 over 60 plus 32 over 3600 and you should get forty five point four seven five six degrees and so that's the answer now let's try some more examples try this one convert 38 degrees 41 minutes and 27 seconds into a decimal in degrees round your answer to four decimal places so this is equal to 38 plus 41 over 60 plus 27 divided by 3600 and type this in exactly the way you see it in your waiter so the answer is thirty eight point six nine zero eight degrees now let's try one more example try this one 53 degrees 18 minutes and 39 seconds go ahead and convert that to a decimal degrees so it's just going to be 53 plus 18 divided by 16 plus 39 divided by 3600 and that's going to be about fifty three point three one zero eight degrees so now you know how to convert the DMS to a decimal in degrees now let's convert a decimal in degrees back into DMS that is degrees minutes and seconds so let's say if we have the value 38 degrees actually thirty-eight point four two five six degrees let's convert that to degrees minutes and seconds so how can we do this so the whole number that you see here 38 that's your value in degrees so what we have so far is 38 degrees now take the decimal value point four two five six and what you want to do is you want to multiply that by sixty point four two five six times 60 that's 25 point five three six now take the whole number 25 and write that as their value for minutes so it's twenty-five minutes now take the decimal that remains which is point five three six and supplies that by 16 25 36 x 60 is 32.16 many one around this turn there is whole number so in this case that's 32 and so that's going to be the number of seconds so we have 32 seconds so this is our answer 38 degrees 25 minutes and 32 seconds not to confirm the answer type this in your calculator 38 plus 25 divided by 60 plus 32 divided by 3600 it should give us our original value now the answer won't be exact but it's going to be close to it what I have is thirty eight point four two five five repeating so instead of writing five five repeated if you round it this is going to be five six the reason why it's not a it's not going to be an exact answer is because we didn't use the 16 we use we rounded 32.16 to 32 so this answer is going to be very close to the answer that you started with in the beginning and if it's very very close then you know you did it correctly now let's try some other examples let's say if we have 52 point three one seven five degrees convert that to DMS degrees minutes and seconds so first we can see that it's going to be 52 degrees that's the first number that we need to write now let's take the decimal value point three one seven five and let's multiply it by 60 so this is going to be nineteen point zero five and the number nineteen that's how many minutes that we have now let's take the remaining value point zero five and let's multiply that by sixty point zero five times 60 is stream and that's an exact answer so this is going to be three seconds now let's confirm the answer so type this in your calculator 52 plus 19 divided by 60 plus three divided by 3600 you should always do a quick check to see if you have the right answer and you do indeed get fifty two point three one seven five so we know that this answer is correct let's try one more example seventy two point four eight one three degrees go ahead and pause the video and convert it to degrees minutes seconds so let's write the first number 72 so we have 72 degrees now let's take the decimal value point four eight and one three and let's multiply that by 60 so this is going to be 28.87 8 and so let's record this number so we have 28 minutes and then let's take the decimal value 0.8 7 8 and let's multiply that by 60 point 8 7 8 times 60 that's 52 point six eight now what you want to do is you want to round this number six we need to because of the six we need to round the two to a three so we gotta round up so instead of rawness is 52 we're going to run into 53 and that's the answer now because we round it in this answer is not exact I'm going to converting this back to this number but it should be close so if we type