Answer:
-0.21
Explanation:
instead of 100 you divide 21÷1 its 21 and the rest of the 0s use it to make the decimal go on front so like this one there are two 0s meaning if you have 21 or 21. and for each 0 you go to the left its leaves you with .21 or 0.21 and there is a negative, so you just add the negative. The final answer is -0.21 in decimal form.