0.70
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A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. So the required decimal representation is 70 cents, exactly as in the question. If you wanted to show greater precision, you could write 70.0 cents.
3 cents in decimal
You would write 11 cents as $0.11 or $.11 in decimal form.
50 and a half cents as a decimal is 0.505
16.5 cents in decimal form is 0.165
Eighteen cents would be 0.18 as a decimal.