186 is an integer, so it needs no rounding. It has no parts smaller than 0.01. To indicate the precision of the number, you can write 186.00.
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To find the number you need to multiply by 6 to get 186, you would divide 186 by 6. This calculation gives you 31. Therefore, you need to multiply 31 by 6 to get 186.
When you divide 186 by 3 (the denominator), the answer received is 62 (one third.) Then, multiplying 62 by 2 is how you would end up with what two thirds of 186 is (124.)
70 percent of 186 = 130.2. As you cannot get 0.2 of a question right, we'll round that up to 131. That leaves 55 questions you could get wrong and still score 70 percent - 70.43 to be precise. If the examiner is feeling generous, then they would round up 130 questions correctly answered from it's actual value of 69.89% to 70&, but it might be best not to bank on that.
65% of 186= 65% * 186= 0.65 * 186= 120.9
If you mean for collecting purposes, it would depend on the age, the mint markings and the condition. Otherwise, 37 quarters is $9.25 and 186 nickels is $9.30, so the nickels would be preferable by 5¢.