30000
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There are 1000 milliseconds in one second. Therefore, 30 seconds is equal to 30 x 1000 = 30000 milliseconds.
There are 1000 decigrams in one hectogram. Therefore, 0.03 hectograms is equal to 0.03 x 1000 = 30 decigrams.
You have to know, "percentage of what". For example, 30% of 1000 = 30/100 of 1000 = 30/100 x 1000 = 300.Probably faster like this: 30% of 1000 = 0.30 x 1000 = 300.
1 kilometre is equal to 1000 metres. One metre is equal to 1000 millimetres. Therefore, one kilometre is equal to 1000 x 1000 = 1,000,000 millimetres.
x----- = 0.251000So x = 250, and the fraction 250/1000 is equal to 0.25