Question

Change 7.2 grams to milligrams.

Answer 1

Multiply 7.2 by 1000 :)

Answer 2

\[\frac{ 7.2 g }{ 1 }\frac{ 1 mg }{ 10^{-3} g } = .....mg\]

Answer 3

multiply by ratios of 1, and keep track of how units cancel

Answer 4

always refer your conversions to the base unit first , for mass (g)

Answer 5

ok

Answer 6

For instance , kg to mg

\[\frac{ 7.2 kg }{ 1 }\frac{ 10^3 g }{ 1 kg }\frac{ 1 mg }{ 10^{-3} g} = .....mg\]

Answer 7

notice, kg and g cancel out and you are left with 7.2x10^6 mg

Answer 8

That is what i mean by converting to the base unit , for mass (g) first

Answer 9

I 100% agree with you @DanJS

Answer 10

So all you have to remember, is how each prefix relates to the base unit, that is it

Answer 11

Same for if you are switching systems. To figure if you need to multiply or divide, set up the fractions so that units cancel in your favor,, IE
\[\frac{ 5280 ft }{ 1 mi } \]or
\[\frac{ 1 mi }{ 5280 ft }\]depending on how your units need to cancel

Answer 12

agreed !!!!! you deserve a medal :)

Answer 13

Multiply by ratios of 1. easy as that

Answer 14

wory about the numbers at the end, units are the most important