6.15 is the decimal form
123/20 is the fraction form
163.7 is a decimal.
87.5 as a decimal would be written as 0.875.
It is already in decimal form.
0.018 is already written as a decimal. As a fraction, it would be 18/1000 or 9/500.
It would be 0.0012
615 is a whole number and as such has no need to be converted to a decimal. It could be represented as 615. but it ends in a five and so the terminal decimal is meaningless.
.615
0.344 is a decimal.
163.7 is a decimal.
87.5 as a decimal would be written as 0.875.
It is already in decimal form.
To convert a decimal to a percent, multiply the decimal by 100. The result is the conversion as a percent. In this case the result is 615%
Written as a decimal 7/10 would be .70
In a decimal form, that quantity would be written as-0.12
0.018 is already written as a decimal. As a fraction, it would be 18/1000 or 9/500.
The fraction would be written as 4/400 and would be 0.01 as a decimal.
-7.09 is a decimal. Fractions are written in their simplest form. That would be -709/100