Assuming all numbers are measured quantities, do the indicated arithmetic and give the correct number of significant figures.

$.\frac{0\mathrm{.}3740\mathrm{.}22}{3\mathrm{.}270}=$

b$.8\mathrm{.}940-8\mathrm{.}910=$

c$.8\mathrm{.}980+8\mathrm{.}920=$

d$.0\mathrm{.}0001940\mathrm{.}7+1\mathrm{.}000=$