Add or subtract the following measurement be sure each answer you enter contains the correct number of significant digits

Question

16.700mL-14.50mL=? ML
2.7mL+6.507mL=?ML
13.97mL+6.7mL=?ML

Answer 1

16.700 mL - 14.50 mL = 2.20 mL
2.7 mL + 6.507 mL = 9.207 mL
13.97 mL + 6.7 mL = 20.7 mL