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Solve the following questions · Q25

Q.Round off each of the following quantities to two significant figures : a. 25.55 mL b. 0.00254 m c. 1.491×1051.491 \times 10^5 mg d. 199 g

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✓ Free question

a. 25.55 mL — keep digits '2' and '5'; next digit is 5 (≥5) so round up the second digit: 25.55 → 26 mL.

b. 0.00254 m — significant digits are 2, 5, 4; keep '2' and '5', next digit is 4 (<5) so leave unchanged: 0.00254 → 0.0025 m.

c. 1.491×1051.491 \times 10^5 mg — keep '1' and '4'; next digit is 9 (≥5) so round up: 1.491 → 1.5, giving 1.5×1051.5 \times 10^5 mg.

d. 199 g — keep '1' and '9'; next digit is 9 (≥5) so round up: 19 becomes 20, giving 2.0×1022.0 \times 10^2 g (written this way to show exactly 2 significant figures).

✓Final answer

a. 26 mL b. 0.0025 m c. 1.5×1051.5 \times 10^5 mg d. 2.0×1022.0 \times 10^2 g

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