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

Question

17.650mL-8.87mL=?ML
0.900mL+5.87mL=?ML
12.87mL+10.927mL=?ML

Answer 1

17.650 mL - 8.87 mL = 8.780 mL (The answer contains 4 significant digits)

0.900 mL + 5.87 mL = 6.77 mL (The answer contains 3 significant digits)

12.87 mL + 10.927 mL = 23.797 mL (The answer contains 5 significant digits)