Hint: To find out how many milligrams make one kilogram; we first find out how many milligrams make one gram. Then, we would find out how many grams make a kilogram. Finally, after finding the number of milligrams that make a gram and amount of grams that make a kilogram, we multiply these two results to get the number of milligrams that make a kilogram.
Complete step-by-step solution: Before, starting first let us know about milligram, gram and kilogram in detail. Milligram, gram and kilogram are the units of measurement of the mass of an object (there are many such units of measurement of mass, but for now we will consider only these three). Now, although all these units are used to measure mass, these three differ in the quantity of mass they denote. Generally, for larger masses, a kilogram is used to denote the mass while for smaller units, we use milligram. Now coming back to solving the question, we have, 1 gram = 1000 milligram -- (1) 1 kilogram = 1000 gram -- (2) Now, since, we want to find the number of milligrams in one kilogram, we use the results obtained from expression (1) into (2). Thus, we get, 1 kilogram = (1000)1000 milligram (Since, 1 gram = 1000 milligram) 1 kilogram = 1000000 milligram (=milligrams) Hence, there are 1000000 milligrams in one kilogram.
Note: When solving questions involving the conversion of units of mass from one unit to another, it is always useful to remember the basic conversion formulas. For example, in this case, although, one may not know the conversion from kilogram to milligram directly, however, if one knows the basic conversion such as conversion from kilogram to gram and then gram to milligram, one can do the conversion from kilogram to milligram efficiently.
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