The place value and face value of the underlined digit in the following number is $\mathrm{k}$ and $\mathrm{m}$ respectively, then find the value of $\mathrm{k}+\mathrm{m}$.

$35\underline{7}920$

The place value and face value of the underlined digit in the following number is $\mathrm{k}$ and $\mathrm{m}$ respectively, then find the value of $\mathrm{k}+\mathrm{m}$.

$1\underline{2}46686$

If the place value and face value of the underlined digit in $12\underline{3}45$ is $k$ and $m$ respectively, then find the value of $k+m$.

Write the standard numerals for the following.

$300000+20000+6000+500+90+7$

Write the standard numeral for the following.

$900000+8000+400+20+8$

 Use all the digits only once and form the smallest $6$-digit number.

$4, 1, 7, 3, 5, 2$

Use all the digits only once and form the smallest $6$-digit number.

$5, 1, 6, 3, 8, 9$

Make the smallest $6$-digit number by using the digits $1, 6, 3, 5, 0, 7$ only once.

Write the smallest $5$-digit and the greatest $6$-digit number, then find the subtraction of them.