In decimal numbers the numeral on the left side of the point are the whole numbers and the numbers on the right of the decimal point are the parts/fractions of a number.
So in this decimal number 3.4 ---- 3 is a whole number and 4 is a fraction or part of a whole number. Because there is only one number on the right side the 4 represents 4 tenths. 3.4 can be written as 3 4/10 ( three and four tenths).
If there are two numbers on the right side of the decimal point then they are 100ths. So in this number 5.75 the .75 is 75 hundredths = 5 75/100.
If there are three numbers on the right side of the decimal point then they are 1000ths. So in this number 12.357 the .357 is 357 thousandths = 12 375/1000.
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you turn the decimal into a fraction then you turn the fraction into a whole number and add a percent sign
As a fraction it is simply 18/1 and as a decimal it is simply 18.0
Why do you need a calculator?
If you know how to turn a mixed number into a fraction and a fraction into a decimal do that then make it negative.
Fraction to decimal: Do the division. 3/4 = 3 divided by 4 = 0.75 Decimal to percent: Multiply by 100. 0.75 = 75 percent