Add `1+0.1+0.01+0.001`

The value of ( 1+ 0.1 + 0.01 + 0.001) is "_____________" .

Find the sum of 1 + 0.1 + 0.01 + 0.001 + … (0.1)^(9)

What should come in the place of question mark (?) in the following questions ? 0.01 xx 0.1- 0.001 / 10 +0.01 = ?

The value of 0.001+ 1.01+ 0.11+ 0.0001 is

What should come in the following at the place of blank space ? 0.001 xx0.01 = 0.1 + ______