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Hello Hello !!
To express a decimal number as a percentage, simply multiply it by 100 and add the% sign afterwards.
Example: express 0.356 as a percentage
                                                                0.356 × 100 = 35.6%
 
Now, for the opposite, turn 35.6% into a decimal.
You should know that the symbol % ​​means ÷ by 100. So, let's replace the symbol of% by ÷ 100:
                                                        35.6% = 35.6 ÷ 100 = 0.356
 
Do not hesitate if you have other questions.
KH