When we spend money we calculate things in dollars and cents. Dollars being the whole numbers and the cents being the fractional part after the decimal. Example: If I buy a candy bar for $1.53 and I pay $2.00 then my change is $0.47. This is something we do in our every day lives.
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No. Most can - simply by writing the decimal above ten to the power of however many decimal places there are. 0.3456789 can be written as 3456789/10000000 But some decimals are endless - such as pi. That cannot be written as a fraction.
In most countries, you will use them when you handle money, as in $2.50. Quantities on products are also sometimes expressed in decimals, e.g. "1.5 kilograms" or "2.2 liters".
"Most common" is the one that is most common.
The most common fraction is 1\2
Milk is the most common weak base.