Question

If A = 2.331 cm, B = 2 cm, then A + B = ?

• A. 4.431 cm
• B. 4.43 cm
• C. 4.4 cm
• D. 4 cm

Answer 1

Answer: (C)

4.4 cm

Answer 2

A + B = 2.331 + 2.1 = 4.431 = 4.4 cm

Since B has 2 significant figures

$\therefore$A + B must have only 2 significant figures