5.7 + 6.2 = 11.9 You can round it, but you don't need to. Really. Round it becomes 12. Then its more clear. But if you don't round, it is more exact.
Step-by-step explanation:
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Well, there are 100 pennies in a dollar, and 10 dimes in a dollar. So, the ratio could be 10:100, or 1:10.
6 3/4
to turn a mixed number to an improper fraction...
take ur whole number (6) and multiply it by ur denominator (4)....6 * 4 = 24...now add that to ur numerator (3).....24 + 3 = 27...now put that over ur original denominator (4).......27/4 <== ur improper fraction
basically, ur just doing this : (6 * 4 + 3) / 4 = (24 + 3) / 4 = 27/4