Va rog sa ma ajutați: 420/180x54/180

First, you want to divide 420 by 180. Then, divide 54 by 180. Lastly, you want to multiply the answers of the two together.
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420/180= 2.3 

54/180= 0.3

2.3 * 0.3 = 0.69

*You just take it step by step. Hope I helped. :)

Start by simplifying the fractions, its usually easier to leave it as a top heavy fraction. So we would do 420/180 which can be simplified to 7/3 (we can divide both the top and botton of the fraction by 60)
Then we can do 54/180 which is 3/10.
Now we have some nicer fractions all we have to do is multiply 7/3 x 3/10. To do this we can just multiply the tops and bottoms of the fractions so we get 21/30. This can be simplified one last time to get a final answer of 7/10 or 0.7