You’re taking Physics, right?

Ummm…you’ll need a chart, it’s easiest to explain that way. I can make one for you in paint and send it, if you like.

I’ll try to explain.

First you take 5 mg and make it fraction-esque.

5mg/ 1 c.

Stack them on top of each other like you did in third grade.

Now you need to convert miligrams to grams, so along side write

1000 milligrams/ 1 gram.

[It’ll make sense at the end, trust me]

Now make grams into ounces .

28 grams/ 1 ounce.

okay, [this is where my memory fuzzes, so bear with me]

now make ciggs per pack a fraction.

so put

20c / 1 pack

now you have all these fractions stacked up in a line, just multiply! right across the top. All the numbers on the top row, you mulitiply. ALl the numbers on the bottom row, multiply straight across to get a fraction. Then reduce.

That answers the tar question. Use the same format for the rest on number one.

2) use the same chart

convert miles per hour into meters per second, using a REVERSE of this [I answered a similar question, and am too lazy to retype it]:

First you take ___m/s and make it fraction-esque.

___m/ 1 s.

Stack them on top of each other like you did in third grade.

Now you need to convert seconds to minuets, so along side write

60 seconds/ 1 minuet.

[It’ll make sense at the end, trust me]

Now make minuets into hours.

60 minuets/ 1 hour.

okay, [this is where my memory fuzzes, so bear with me]

now convert meters into miles.

there are 1609 meters in a mile

so put

1609/ 1 mile

That’s how i remember. I’m in AP Physics, so I think I’m right. Good luck! If you want the diagram, feel free to email me.