In 10×10×10×10×10×10×10×10×10×10, 10 multiplied 10 times.
We know that the exponent is the number of times the base needs to be multiplied.
Here, the base is 10, which is multiplied 10 times.
∴10×10×10×10×10×10×10×10×10×10 can be written in exponent form as 1010.
So, the exponent of 10 in 10×10×10×10×10×10×10×10×10×10=1010 is 10–––.