"milli-" = 1/1,000 (thousandth)
"micro-" = 1/1,000,000 (millionth)
"nano-" = 1/1,000,000,000 (billionth)
"pico-" = 1/1,000,000,000,000 (millionth of a millionth, "micro micro-")
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Yes. When the units are the same, compare the numbers. The units are both kilograms (kg), thus the numbers can be compared: 2 < 7 → 2 kg < 7 kg.
Because in any given measurement, there are more of the smaller units than bigger units. There are less than 2 metres in my height (1.78 m). But in a smaller unit, eg centimetre, there are is 178 of them. That is a staggering 1780000 micrometres tall :) But, then again, that is only 0.00178 kilometres :(
To compare 2 lb and 42 oz, we need to convert both measurements to the same unit. Since 1 lb is equal to 16 oz, 2 lb is equal to 32 oz (2 lb x 16 oz/lb). Therefore, 2 lb is smaller than 42 oz.
Ten times smaller.
it is smaller (1/2)/2=.25