deci refer to ten. Decimal is a system of counting based on ten and its powers.
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Per cent means per 100. 37% = 37 hundredths = 0.37
Whole number computation is 90% of decimal computation. The difference is that you need to understand where to put the decimal point in the answer. It's impossible to do decimal computation without knowing how to do whole number computation.
It is not a question of helping or not helping. A percentage is, by definition, parts per one hundred!
A comparison between two things that are similar in some respects, often used to help explain something or make it easier to understand. 2. A similarity in some respects.
In most countries, the main unit of money (for instance, the United States Dollar, the euro, or the British Pound) is divided into 100 smaller units. Money amounts are written as decimals, with two decimal digits. This may help in part, but it is a bit restrictive, since only two decimal digits are ever used - never more or less.